Small Base Dies explained
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- Опубликовано: 2 авг 2024
- What is a Small Base Die and when should you use one? Here I explain why a Small Base Die may be needed and I personally learn something new while on camera. Due to the twist ending please hold your comments till watching the entire video! If you enjoyed this video please give me a like and be sure to subscribe for future channel updates as I plan to put up a new video every week or two. I’m B.C. and welcome to my channel Deuce and Guns!
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Items featured in this video.
Redding Small Base Die .223
Lee Classic Breach Lock single stage press
Generic Calipers from Cabela's (not the best but good enough)
Lee .223/5.56 reloading die set
One Shot Case Lube
Random 5.56 brass picked up from firing range
H&R Handi Rifle in .223
Speedy - AR-15 - DPMS Sportical Upper on a Plum Crazy lower
Vera - AR-15 - Hand Built/Purpose built 3-gun rig.
Extra AR-15 Bolt and carrier - Palmetto state armory (HTP/MPI)
Chamber Flag - Tapco
Eye Protection - Wiley X XL-1
Hearing protection - Howard Leight 
Развлечения
The firing pin is "blocked", until it twists fully into battery. Notice that the next time that you reassemble your BCG.
This is critical and I’m grateful because I had a bunch of brass I didn’t set the shoulder back on far enough and the bolt was just ever so slightly out of battery.
You have a PROBLEM with your gun IF it fires the primer without being fully chambered.....
The firing pin should NOT reach the primer without a locked bolt.... unless you have an out of spec. (Too LONG) firing pin.
Word!
Thanks for the video, I just spent a frustrating day at the range. I had made a 30 cal can full of .300 Blackout and got to fire 6 rounds before it started having a 'Fail to Extract'. Drove the 26 miles home and put everything through my case gauge and found about 1/3 of them (varying head stamps) were too big, either shoulder not far enough back or just too tight around the body (fat portion). Only thing I could figure was the dies had come loose just enough to bring it out of spec. Lesson learned, gauge every time I resize.
Small base die only size the lower bottom of case where the web of the case expands more when fired in auto loading rifles when compared to a bolt action or single shot rifles. A full length die only sizes the case mouth, shoulder, and most of the length except the bottom. You can see a slight bulge where the web of the case has expanded and that is the area that a small base die works down.
Very helpful. Just ordered small base die set for 300 upper coming soon, thank you for the video
Good video Sir. No long and annoying intro, informative and straight to the point.
This is very useful and very explanatory I have the dpms 308 upper and the small base die is very much needed for the brass to fit and chamber correctly thank you again for this video
Does you die allow the whole case to enter it? I cant get the last 1/2"-1/4" to be fully into the die
I have been handloading / reloading for years before I had a problem with an ar 15 just like you are saying I bought my son a new ar 15 before he left for basic training and was shooting when bang! he had my handload fire out of battery exactly as you stated in the video. I kept the bolt as a reminder in my reloading room here is a picture
All my ammo worked perfect in my dpms. I built a new rifle with a 223 wylde barrel. You guessed it. None of my ammo fit. I measured my brass. New brass had a .71. My brass fired from my dpms measured .73, and resized measured .72. They didn't fit in the 223 wylde chamber. I bought a rcbs small base die and it resized to .71. Works perfect. That's all I use now. The 18 inch 223 wylde barrel is so accurate I couldn't believe it. I haven't shot this good since I was a 20 year old Marine.
It happened to me with a 9mm pistol. Broke the firing pin. Lesson learned to use Small Base Die on rounds that have not been shot through your weapon. Good video.
Thank you for sharing your expertise.
Thanks for the vid, explains alot !
Thank you for sharing your expertise
very good! thanks. beginner rifle loader, very helpful.
Me too! thanks.
I'm just getting into reloading. I ordered the AR Series RCBS small base dies, as my first set of dies. I didn't want to waste my money on a standard die set, only to find out that they wouldn't chamber in my DelTon AR 15. This may not have even been an issue, but now I know FOR SURE that my .223 rounds WILL chamber in anything that I own. I just hope they aren't TOO small, and cause headspace issues. I plan on setting my die LONG, to begin with, and then do manual checks on the bolt closing, and locking. I can make small die adjustments as needed. That way I'll only be bumping the shoulder back, to the correct headspace amount needed.
Great video 👍
depending on how far the bolt actually rotates determine how far the firing pin will be able to protrude through the bolt. look at the case and see if there's a dimple where the firing pin hit it if there is more than likely is very light by the way yeah it's best not to fire around off with a partially chambered round
I had an ar10 that I reloaded for without the small base die and it had the problem you describe but it didn't fire either. Scary any time this happens. Small base dies are recommended for semi-autos and lever actions. Thanks for the info!
Good stuff
My Sig MCX has a very tight chamber and I have had rounds stick in it that load easily in my SS Ruger Mini-14.
Not telling anyone what to do but, roll sizing is a really good way around the small base die.
Thank you
I too have heard from people who seem to be extremely knowledgeable and experienced say that an AR can have an out of battery fire, but every one that I've checked cannot. The firing pin won't protrude past the bolt face 'till the bolt has rotated to a locked position. Maybe if one combines some out of spec parts it can happen, but not with a proper bolt and firing pin. I've had many people tell me that I need to use a SB die or I'm gonna blow my guns up. 5.56 chambers are so loose I don't even get sticky chambering with neck sized brass so there's no need to use a SB die in them.
AR15's cannot have OOBD due to the amount of travel the bolt assembly has in the bolt carrier group, in order for the firing pin to protrude from the BCG. Just take out your BCG, push the firing pin forward, and slowly close the bolt until the firing pin protrudes from the bolt face. the firing pin on mine won't protrude until the very last 2mm of travel of bolt closure, after a full and complete locking lug closure, not to mention the shrouded firing pin.
Your result is right on par with reality, and I'm fairly certain most of those reloaders blamed a powder goof on the rifle.
Interesting how that rifle won't chamber without a small base die, I always thought those dies were useless hand wringing over nothing.
Out of curiosity, is the chamber 223 or 556 spec? I've been resizing brass from a military range with 249's with a Lee full length die, no issues in a 5.56 chamber
Thanks for the additional info. I went back and forth on even uploading this video after I spent most of it being wrong but I figured someone would chime in and educate me further on the issue. The Saber Defense barrel is chambered for 5.56 and will chamber 95% or more brass that has only been through the full length die but there are a few that are just too large right above the web area (maybe my Lee die is slightly out of spec). If I force the brass in I can see where the chamber sized the last quarter inch of the brass above the head down by maybe a thousandth. I could probably get the chamber reamed but it shoots so well I'm afraid to mess with it. I may try polishing the chamber in the future and see if that'll eliminate the need for a small base die.
+DEUCE AND GUNS a normal 5.56 chamber is 1/1000 of an inch more forgiving than my 223 wylde barrel. it made the difference between about a one inch group, to a group where all five holes were touching. Not necessary, but fun when you pick up your target at a public range and the guy next to you has been bragging about his $2500 AR. A simple barrel change on you're old DPMS can embarrass people next to you. lol
ya.... i was gonna say....(and thank god it didnt go off.....if it did, that AR needs some work......)
even my m1 garand prevents out of battery fire.....
however....its a free floating pin, and i do get slam fires with federal "premium" ammo
when your shooting and a deer, and end up hitting it 3 times.....kinda messes up the meat...
but.....even if you just chamber a round, and then unload.....it leaves a small dent on the primer. (so i always ALWAYS keep my muzzle in a safe direction)
if you shoot a round, and then eject the 2nd round before you fire it.....it leaved an even bigger dent
the ww2 and post M2 ball ammo had very hard primers..... and slam fires were not an issue.
just gotta reload for it i guess......which makes my 50 dollar adjustable gas plug sorta pointless...
@@deuceandguns I wouldn't polish the chamber. The chamber requires a certain roughness in order to maintain what is called "Skin Friction" when the cartridge brass expands immediately after the charge ignites. Eliminating the skin friction will cause the tiny little lugs of the bolt to deal with the pressure that they were never designed to hold up to. Catastrophic failure of the bolt will occur. If you are satisfied with the groups that your rifle prints as it is, I would keep sizing your brass as you have been. Good job on your video.
The Ruger AR-556 has a very tight chamber. When I started reloading for it I was getting lots of jams. I use Lee dies but I ended up having to buy a RCBS small base resizing die because Lee does not make one. It helps somewhat but it still hasn't cured the problem.. I've talked to some precision rifle shooters in our club and they told me they've had the same problem with Ruger bolt-action rifles. that Ruger really squeaks the tolerances on their Chambers.
Russell Sandidge Present day Rugers are JUNK, brother. Trust me. The last TWO that I've bought have been horrible. A new 10/22, and a new .22mag LCR. BOTH have major light strike issues, among other things. The truth is... Taurus is making MUCH better firearms, than Ruger these days. I'll NEVER give Ruger another penny.
@@jamiesloan5902 I have a ruger ar 556 MPR and I reload it with new brass and range brass only using a resizing die and have never had a malfunction in the rifle at all, granted it's only got about 2000 rounds through it but its ran steel case, reloads and factory 55 gr and 62 gr so far and not a hiccup
Never had a problem with my MPR
Once again, thanks for making this video. It'll help a lot of people. Hopefully before they go shoot their new gun.
Love the Firefly reference!
Speaking of Firefly, "The Expanse" just had their second season start tonight. If you're not watching it I highly recommended for a Firefly fan.
I watched the first season of The Expanse, and I've read all the books. Great series! Thanks for the heads up, I didn't realize season 2 started tonight. I've got it set to record now!
DEUCE AND GUNS: I introduced my kids to Firefly a couple of weeks ago and they were so disappointed it was only one season. Haha. Reminded me of how I felt when they cancelled it years ago. Thanks for the recommendation. I will definitely check out The Expanse.
A few years ago I purchased a M1A Loaded. Unknown to me because I did not understand the specifications of a match barrel, I was very close to returning it because my rounds were getting stuck and not extracting. Some would not chamber and become stuck. I was frustrated beyond belief. I noticed, by accident, that factory ammo worked just fine. Well, one day at the range one of the club members noticed me punching out brass with a cleaning rod. He initiated the conversation with, Are you Reloading? Yep and I explained the problems. He asked, is that a match barrel? Yep I replied. Do you have a Small Base Die he asked? WHAT IS THAT? Well the old guy gave me an education on chamber size for match barrels to improve precision. I immediately purchased the Small Base Die and SHAZAM!! Problem Solved. ALMOST! My Armalite AR10 does not have a match barrel. It seems that the chamber size is on the opposite side of the spec and my brass, after being fired through the AR10, is now well oversized. This means I have to maintain ammo stock for the M1A separate from the AR10 ammo.
Firing the small base die made ammo in the AR10 appears to have a negative effect on precision so making all my ammo with the small base die is not an option. So, M1A reloads get marked with a black magic marker after reloading and the AR10 reloads are not marked for sorting when picking up range brass.
Definitely a pain
Thanks for this excellent explanation. I recently bought a 300 blackout that must have a tight chamber. Factory 300 blackout chambers and fires fine, reloaded 300 blackout has issues. Sometimes it won’t go into battery, other times it jams up so bad I have to disassemble the rifle to extract the round.
I’ll definitely eat buying the small base set.
Are you making your 300 blackout brass from 223 brass? There are some headstamps you'll want to avoid because the neck ends up too thick. I list them in my 300 blkout neck reaming video but I'm working on an update to that vid regarding the equipment used.
@@deuceandguns some of it is from 223. Those are the ones I’ve been having a lot of issues out of. I’ll check out the list, also liked and subscribed, thanks a lot!
@@deuceandguns I just ordered some small base dies as well
Fun video to watch
I been reloading for 223 for 3 years more then 10.000 rounds no problem with Redding. Since yesterday 🤦🏻♂️
I need a small base !!
Same here. Went years without needing one then suddenly I did.
Redding are already "small base" which is why you've been fine...or maybe lucky out the gate is a better description. If you're suddenly not fine then it's possible something changed, something you've most likely just been taking for granted. Did you change shell holders? Did a locking ring move on your die? There's a few other things that can change but, the bottom line is that I've been able to overcome all of them by simply readjusting my die. Redding does make a set of thinner/thicker she'll holders just in case you're out of adjustment (or you're dead set on cam-over of your press).
It won’t fire the primer if the bolt isn’t fully in battery since the firing pin is recessed and won’t reach the primer if the Bcg is unlocked ever so slightly. That’s inherent in the design. What your referring to is head/case separation or a round cooks off in the chamber, but it’s impossible for it to go off out of battery unless you have a ridiculously long firing pin that’s out of spec.
If your bolt is not fully seated it will not allow the hammer to fully fall forward blocking it from coming in contact with the firing pin
so was the primer dimpled at all? I have never seen an oobd on an ar15. I have seen wrong ammo or bad loads do some serious damage though. I would suspect that was what actually happened when you saw the gun blow up.
I have to use it on .308 mil spec brass. I don’t have to use one .223 mil spec.
Just a thought. If the primer were loose or not seated deep enough and the bolt did not fully close, would the firing pin then be able to reach and detonate the primer?
I cut down 5.56 brass to make 300 blackout then full length resize it. I've put them all in a Sheridan engineering case gauge and they were good. I presume they will chamber and fire from my 300 blackout. I will find out in a few weeks next time I go shooting. I guess I'll find out if I need to get a small base die.
I'd test all empty brass for fit in your chamber before loading, then you'll know for sure! If some don't fit, which can happen, you bag them separately with a note and work on that problem later. But no disappointments at the range!
This has happened to my M1A ,where sometimes the reloaded case will not chamber and the bolt will not fully close ..I pull the trigger but it never fires,under those circumstances . It may be a safety built into the rifles, or the bolt is out of battery.
That's what I've come to understand. The bolt, bolt carrier, and hammer are designed is such away that if the bolt is out of battery the hammer will strike the bolt body or carrier before striking the firing pin. This experiment taught me that regardless of how much a person seems to know about a subject if they can't demonstrate what they are talking about then always take their info with a grain of salt. Thanks for watching.
Your video was a great demonstration..
Thanks for sharing your video, because I now know that it's not only my M1A that won't fire. Your's also won't fire. And I'm betting most rifles won't fire....Canada
+DEUCE AND GUNS The firing pin works on the Newton cradle principle and is the same length as the bolt when fully locked as the hammer strikes the firing pin. This is a safety designed feature to insure primer will not fire out of battery when bolt isn't fully locked. The face of the hammer transfers most of its energy to the bolt carrier when bolt is unlocked since the lip that contacts the hammer first when out of battery.(not fully locked) A second safety feature is the telescoping bolt to prevent firing pin from contacting primer until it is locked.
+lastchapter I thought I got a bad barrel at first. I was not happy. 223 wylde is just that tight. It has to have the .71 base.
Great video B.C. Thank you for sharing. I like your single shot Break open rifle with the bull barrel, who's the manufacturer of it?.
Kind regards!
Eric Dee.
Those were manufactured by H&R 1871 and were called the H&R Handi-rifle. They stopped production a few years ago but you can still find new/old stock in big box stores like Walmart, Gander Mountain, Bass Pro Shop, and Academy sports.
DEUCE AND GUNS: interesting, I like it, thank you for your response B.C. keep the videos coming. I love your content and educational value.
Kind regards!
Eric Dee.
An empty case with a live primer in it never makes any kind of a bang when its struck by that firing pin
The Ruger ar-556 has got a tight chamber. I think I'm going to have to purchase one of these dies because if your reloads are not perfect
the bolt won't close all the way and you get a live round jammed in the chamber. Other ARs I have owned are more tolerant . But not this Ruger ar-556!!
Good vide but to get a out of battery fire would require gun to be out of order too, which is possible of course! what you video showed was that an AR in good order has redundant safety features which is a good thing for people to see but NOT rely on is possible.
I'm late to the game of reloading here but .223 reloaded with a small base die, will it work in a bolt gun as well as ar?
I believe it happened to those individuals when they let the bolt slam home in that scenario
I suppose it is possible but I have never seen any AR style rifle fire, when the bolt is not in battery. On .308 AR's, I have had multiple issues with the round not going fully into the chamber and the bolt not fully into battery. Once again, I wont say it can't happen but I have never seen it.
I always size for my semi autos using a small base sizing die, and check each case with a wilson case gauge or a rcbs precision micrometer die. Full length sizing dies are fine for bolt gun's, but not semi autos. Better to be safe than sorry.
I don't think the primer was necessary, but great demo.
I see this is an old post and I am getting into hand-loading rifle. I already hand-loader pistol. My question is regardless of caliber 223/556 or 308 every time you shoot a semi-auto you should/need to run your brass through a small base die?
Not always. In my personal experience I only need the small base die if I have multiple firearms that fire that same cartridge and/or I'm using found brass from the range. This is because one chamber may be a slightly different size than the other. At this point I just assume I'll own multiple of everything and always get a small base die set when available.
I think you're getting a light primer strike (or no primer strike at all) because the bolt is out of battery.
correct
Do I need a small base die for 6.5 creedmoor in AR platform?
I need one for My 300 magnum built by PO AKLEY
THIS IS EXACTLY what happend to me last weekend. It was driving me nuts at the range. So, you only SB resize them once? what do you use on subsequent reloading. Thanks for the video by the way
If you only have one rifle that shoots that caliber then you probably just need to small base resize them the first time. If you have more than one rifle in that caliber you may need to use it every time.
@@deuceandguns Roger that and thank you for the reply
If i have a problem with this i would just change a shell holder! Which would give me the same out come as a sb die!
So much no
If the chamber does not go all the way home the firing pin will never strike the primary and it will never go off out of battery
Where Do i purchase a Base die from what company?
If the action is working properly, it is supposed to prevent firing before the bolt is locked. It's not impossible to find one that will let it happen, but that is a big enough safety issue that you shouldn't shoot that rifle until the issue has been fixed.
I would recommend you do some more research about headspace and case dimensions. You might get lucky with a small base die, but they are not meant to fix headspace problems.
I was wondering what could be wrong with your bcg for the whole video tell the end. Lol. Yea like others have prob said. The bolt on an ar has to be in battery for the firing pen to be able to strike the primer. Keep out of battery detonations from happening.
07:15: So... the gun did what it's supposed to do (not go off when out of battery)?
the bolt was too far back to fire now if it closed a bit more but still not all the way i probably would fire
So after using my small base should I just use a full length as long as it’s for the same chamber. Thank you
Correct. You could continue to use the small base die with the only real consequence being possible fewer loadings that brass can take before it splits.
I have never seen any gun go off if the round is not fully chambered.
Congrats..you explained the issue caused by this obvious issue, but you failed to mention how to adjust the die in your press to achieve the desired sizing.
Per RUclips's terms of service I can't show how to reload. About a third of my channel was about reloading at one point but it's mostly deleted now. Only the most generic reloading videos remain.
DEUCE AND GUNS geez Louise is it that bad now is it??? My god ..I had no idea it went that deep nowadays. Nonetheless, everything you did share was awesome info. Thanks for the video man’
I think the first use of small base dies were for the 99 Savage some of these had very tight Chambers that caused chambering problems with reloaded brass I suspect some brands of brass were rather soft in the head area,ha kinda like some polititians! My wife's uncle had a 99 Savage in 300 that I reloaded ammo for him that peticular rifle had a very loose chamber it would cycle just fine with regular full length size dies my cousin Delmas had a newer one that would not work very well at all untill he got a small base dies then it worked just fine.Ive heard of 760 Remington pump rifles being tight maybe but in my familly uncle's brouthers dad's so on had quite a few none had a problem with reloaded ammo mine in peticular had a rather sloppy chamber and brass life was not too good!!
it depends on the length of the FIRING PIN. they aren't all the same
some firing pins won't reach the primer when out of battery. some will.
the guns blowing up are from head spacing issues
Bad headspace as well as case head separation.
Hey, I'm new to reloading and I am trying to pick out my first set of dies. RCBS is selling a small base 2 die set for 300 blackout for $14 less than a full sized 2 die set. I'm planning on reloading for a semi auto 300 Blackout AR, so it seems to me that I would be better off just purchasing the small base set. Its cheaper and it will help me avoid exploding my gun due to the cartridge being too large. So is this good reasoning? Can I use a small base die for every load or is this only for specialty loads?
Also, the SB set says it has a tapered crimp, while the full sized set says it has a roll crimp. From what I have read the tapered crimp is a better crimp for semi-autos. Is this also correct? If so this would be another good reason to get the SB set.
+2ndAmendmentGlock RCBS dies are very good. The small base die set will work great for making 300 blkout brass from .223 brass. Once the brass is made it will work the brass more than the regular dies when reloading which will slightly shorten their life span some (depending on your chamber) but the round will fit any firearm chambered in 300 blkout. Worst case scenario is that your chamber is very large and instead of 30 reloads the brass can only take 20 before it cracks. These numbers are estimates and highly variable on the brass, bullet, powder type, and load. Also, the taper crimp will help with case mouth life and work great but some say the roll crimp gives better accuracy. Luckily, the 300 blkout was never intended to be a long distance accuracy round making the taper crimps just fine.
get the AR series. the seating/crimp die in the AR series is more forgiving for auto.
Should you use small base die repeatedly on the same brass over and over ??
Technically, one should keep all brass separated by firearm and only neck size after it's first shooting. Anything else will lower the life expectancy of the brass. I've yet to notice any difference between the regular full sizing and small base die sizing but there may be a one or two shot difference between the two. I'm ok with 5 vs. 7 loadings on free range brass in an AR-15 if that'll guarantee it runs in all my firearms.
thanks understood
I think his chamber reamer was worn
My ar will not shoot if it is not fully chambered
Wont chamber range brass
The locking lugs must turn our blocks The firing pin
I bought a RCBS SB die and if I adjust the die as per instructions it dimples the shoulder of the brass. To keep from doing this I have to adjust the die to where it is barely touching the shell holder at top dead center. I was wondering if anyone else had this problem?
I'm personally not super familiar with the RCBS SB dies but the only time I've had that issue in general is when I've accidentally gotten lube on the case neck and shoulder. There could be lube inside the die that needs cleaning. I'd give that a shot then contact RCBS if a clean die still dents a clean case.
i had the same problem when i first started using the rcbs small base die. keep the die adjusted according to the instruction manual but use less lube. too much lube will cause a little dent in the shoulder.
Jason Yee You guys were exactly right.
I wasn't using that much, or so I thought\. It was too much though. It only takes a tiny bit.
I only knew the problem because I've done it myself. After reloading tens of thousands of pistol cartridges I thought I didn't need to read up on rifle cartridge reloading before trying it. I was wrong.
I don't understand why too much lube causes a dent. Can someone please explain? I am about to start reloading next week for the first time.
An AR will not go off when put of battery. Take the upper off in that condition and you'll see that firing pin is held away from most fwd position by cotter pin. Too many "experts" out there
It will not shoot where is the lock and legs is rotated
Should of hit your bolt hold open on your Vera guarantee the primer would of went off
Long ago in the 1960s there were no small base dies, also there were more people making dies and a full length resizing die did the job. Then a lot of people left the reloading scene and the remaining suppliers invented the small base die and made even more money from their product. If todays F.L. sizing dies were made to correct tolerances no need for small base dies.
Can I make a video request
I'm always open to new video ideas.
O yea. Bad time
Maybe you need to clean your weapon out Better.. Lee 223 die works good for tight chambers.
You do realize that it’s literally impossible for the AR15/M16/M4 platform to fire out of battery, right?
I did but then someone who I thought had more knowledge told me otherwise...thus this test.
Out of Battery Protection.
Hey D&G! Thanks for the video. You may want to check the headstamps from the brass that won't chamber in your rifle after being resized with the full length resizing die. I have heard that some "foreign" brass may not be manufactured to spec. I recently watched the following video where this guy was converting 223/556 to 300 blackout. I know, I'm veering into apples and oranges territory, but you may find his video helpful. If you don't mind, let me know if it's the foreign headstamps that are giving you trouble so I can avoid them altogether. Here's the link:
ruclips.net/video/_08yZXnk7ro/видео.html
Thanks again!
I'm actually going to go over that issue in a future 300 blkout video and provide a list of troublesome head stamps. The big issue with them is the thickness of the upper part of the case body that ends up being the mouth of the new case. So far I can't find any trend in my issue here. I think it's from being fired in on almost out of spec chamber and I'm picking them up at the range.
The real truth...Ask the die makers for the major manufacturers like Lake City, R-P or Win.IMO, based on my research, is that factory fresh rounds have cases that are smaller than you can even make with the reloader's small base dies. Why? You answered that in your initial comments in the video. They make them small so they work in everybody's firearm and chambers, not just work in some or most. SBDs help assure smooth functioning with no FTFs even in the tightest chambers.
I am trying to reload for my lr308 and want to get the best accuracy possible. I was hoping to just bump back the shoulder a bit instead of doing a full length resize. Would a standard full length resize actually be a tighter fit than the factory PPU and Federal Gold Medal that I have been running?
Yes...It is always a trade-off. Tight radial clearance fit at the rear of the bottle neck case near the head, means precision placement of the bullet in the freebore, if the conical section of the shoulder contacts the mating conical section in the chamber. In bottle neck chambers, the case radial dimensions relative to the chamber dimensions position the bullet radially. The ideal is to have the axial case centerline and bullet centerline coincident with the rifling centerline before firing and a zero clearance fit. This ideal is never achieved, of course. If you try to match case shank diameter with chamber diameter, thermal expansion can freeze the bullet in the chamber. There must always be clearance fit, even if it is 1/2 thousandth of an inch.
Yes. I did measurements using FGMM .308 168 gr. to validate my claims.
I measured my brass that was just fired through my rifle and ran through a Lee Classic Loader neck sizer (I know, very inadequate for an auto loader, it was a gift) and everything was in spec as far as I could tell, except for the web being .002" over. I was hoping to be able to resize the base of the brass and only set back the shoulder a few thousands to make sure it would function and be safe, but also get some of the advantages of only neck sizing. Intended to cast the chamber and get a bullet concentricity gauge and all of that stuff down the road if I can get some promising results.
Hmm! Small Base Dies NOT explained or demo'd! Yup, a not fully closed BCG should not set off a primer. My brass all fit my AR, but when I went to a new .223 bolt action, half the brass would not fit! GO gage was OK.
Uh
So much wrong information in this video
It bothers me that people are reloading ammunition (mini explosives) for their rifles and don't know how they work.
FUDD
The &#@!ng gun isn't going to blow up in your hands if not fully in battery/chamber. AND the bolt carrier group BCG is designed where the hammer can't contact firing pin in every AR I have ever dealt with when BCG is not fully engaged.
This guy is obviously new to gun and reloading world trying to show off what he is clueless about. Entirely too much misinformation.
You might try head space issues rather than small basing. They both have their roles.
Make sure to like and subscribe to stay up to date on my future videos.
You might want to learn a little about the AR and it's BCG before you look like a fool. Of course the firing pin will not travel forward until the bolt is locked into full battery.