Dimensional Characteristics
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- Опубликовано: 16 фев 2024
- Randy discusses the dimensional characteristics of factory and handloaded ammunition, in relationship to the actual case and the chamber.
He recalls a bit of the history of the standardizations of universal dimensional characteristics were put in place and the results.
He also details the things that go into the brass of all cartridges, whether for the reloader/handloader or factory ammunition.
Brass hardness varies from manufacturer to manufacturer. How does that affect the brass you are using?
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I love the fact that when Randy is done talking he simply says good bye.
Randy, you are a treasure! I'm 56 years old and love shooting, handloading and testing. I always love listening to you and learning. I shared some of your videos to some young shooters. One of them said THAT GUY IS CRABBY, HE SOUNDS LIKE YOU ( ME). I told this young man that when I was young, I learned more from crabby older men than from anyone else. I guess because they always held my attention. I then proceeded to tell him that you and I are crabby because of so many young fools out here shooting ! LOL!
Thank you for all you and your wife do and the lesson we can learn
Thank you for sharing your knowledge. Reloading can really make your ammunition really shine.
I can't tell you how much I enjoy and have learned from your program Mr and Mrs Selby. Your experience is worth volumes to me. Thank you for sharing your expertise, and those good old stories.
Semper Fi senior, and I wish I could eat some of those elk hearts that the Real Wife fixes up for you!
over the past 50 years of reloading, I have learned a lot on my own finding varied aspects of what you are speaking about. last year ran across some well respected factory ammo that was on the very edge of being out of specification in primer depth, one rifle fired ok another brand of rifle was miss fire. manufacture of the ammo said it was within specification and the rifle was at fault. chambers like you say may vary and with this crapppy ammo on the the very edge of out of specification made a fail. thank for the great content randy
You’ve got me measuring everything! Great video Randy, one of your best!
Thank you so much for your insightful and informative videos. The breadth of your knowledge and experience in gunsmithing is quite impressive to say the least. I try to learn something new every day and you certainly help with that. Thank you sir. Have a great day and and God bless and keep your videos coming.
Awesome informative information that really helps. Thank you
Jeffrey
Thanks again, Randy as always!!
Thank You for the information.
Thanks for the video Randy. This answers a lot of questions when I have been buying factory ammo, wandering why the bolt would close a little tighter, with one brand of ammo, and a little loose with another. I always thought I needed to clean the chamber. In my 7mm magnum .this started about 7 or eight years ago.
I would love to know what you get in the way of precision, concentricity, diemensional characteristics of expensive custom actions versus blueprinted factory actions. Especialy in a custom hunting rifle not a Bench Rest rifle. Thanks Randy! Love your channel and usualy I agree with you 100% so looks like our mentors and experinces are similar. God Bless you and your family!
When you hear absolute facts and truth from experience. It's a wonderful thing in life.
Thsnk you randy. ❤
I'm not the an expert but this makes sense. Can't argue with the man.
Great video randy, for your use considering price quality etc do you prefer a certain brass. Thanks to you and your wife for all that you do.
Shooting.
A 375H and H magnum' Remingtons 270 grain factory Ammo in a 375 Weatherby chamber. All 20 rounds were high pressure and blowing the primers.
I found 3 rounds in a brand new box of 243 winchester power point 100 grain that wouldn't chamber in my howa 1500. It was the first time in 50 years that I got factory ammunition that wouldn't chamber in one of my rifles.
There was no rifling marks on the bullets, so i am assuming that the base to shoulder oversize as the culprit. Those same 3 factory rounds did fit in the chamber of the rifle that I gave to my grandson last deer season in Alabama though, and that there tells me that my Howa has a tighter chamber than my grandsons 243.
My dadgum 243 is the only rifle that I have ever bought that doesn't need reloading due to accuracy concerns as it will poke all three rounds into a single jagged hole and doesn't matter if it's a Remington core lok or a winchester power point 100 grain. It still holds my personal smallest group of 3 rounds at 100 meters or 109.4 yards. My 257 Weatherby magnum comes in a very close second, but it had to be a load that took alot of time and effort to make it just right.
few years ago purchase 10 boxes of factory ammo for my 280 rem and one box had gun powder all over the box and 9 of the cases had no primers in them! so much for quality control !
Thank you Randy for another very informative video. Could you please do a video on the 221 fireball. It’s a very interesting cartridge but there isn’t much information out there about it.
I didn’t realize how much brass varies until I had to convert 300 Bo the brass in some rounds varies a lot having thick thin sizes etc foreign brass in particular u will need to turn the neck.
I stumbled onto this "Case dimension issue" a few years ago, while loading Virgin/ New Norma brass for a Win. 270, I noticed random cases from a batch were showing signs of head pressure issues, before I reached the desired velocities.
Federal brass untilizing the .473" case has been notoriously soft for a couple decades. I've policed brass from shooting ranges for a long time, and have seen this repeatedly. I gave up on Federal large rifle brass. It used to be excellent stuff. Heavy, thick, and stout.
This was a much needed video Randy. I just wonder if instead of altering a rifle chamber, wouldn't it make more sense to get a custom reloading die with a chamber cast of that particular rifle and recalibrate every piece of brass before loading it? I would not wish to fiddle around with a good performing rifle chamber just because one lot or make of shells does not fit!
No. Use the correct dimension brass to start with.
Thanks for watching.
Thanks alot for the great explanation on this topic. If your chamber is slightly smaller than the brass, whould it be possible to size the brass to fit your chamber?
Not likely.
Thanks for watching.
I might be in a world of hurt! I have about 200 rounds of Creedmoor Sports 30-06 Ammo designed for M1 Garrands and it is all Lupua brass. In fact I bought it because the ammo which is target ammo was Lapua brass and bullets for about $0.20 more per round that just the brass alone from Graff, Mid South, and other reloader componet suppliers. I could not buy the brass and bullets seperatly for the price I got the loaded ammo for. This was purchased through CMP program.
Randy, your video is very timely. This morning I packaged up a Sauer 100 in 6.5 CM that I am returning to them because it is very difficult to chamber Federal Premium 140 grain. Some other brands of ammo would chamber okay and some would not, so we tried a Go gauge and it too proved difficult to seat. Is it safe to shoot? Maybe, but why risk it in a field gun. I've asked Sauer to either slightly ream it or replace it.
Thoughts on chamber measurements? Casting chambers? Cerro safe or sulfur / graphite ? What in your opinion is the best way to get internal measurements of a chamber.
Fire a case and measure the diameter.
Thanks for watching.
Hdy, FC and Win 308 base bulge in a saami chamber. I would not small base die these unless absolutely necessary due to brass fatigue.
Shouldn't full case resizing of the case fix this? Assuming the sizing die is sized correctly.
Honest question....
You are exactly right. If the brass is new out of the box, you should be running it through a FL sizing die before you load and fire it the first time. After it has been fired the first time, it is formed to your particular chamber. All other sizing operations with a .002" shoulder bump brings the brass back into perfect dimension.
Say something about 35 whelen randy if you get a chance love the video's
Lapua is from Finland. Norma from Sweden. Sellier & Belliot Checkia . DW German. That’s 4 right there
What does the SAAMI spec say?
It says nearly everyone doesn't use 100% of it. Says "recommended" right there in fine print.
It is online. Look it up and read the information.
Thanks for watching.
Hey Randy would a small base die help with ( out of spec brass ) ? Thanks for sharing knowledge with us !…..
This is from personal experience, and I'm assuming 308 or other common nato platforms. Small base dies are an excellent choice for a tight chamber, specially in such auto loading platforms. This is a feeding issue looking for a solution. Brass is not necessarily out of spec and can be forced into spec much easier than finish reaming a chamber. However, there is such a thing as over working or work hardening brass. The solution to work hardening brass is to bring it to cherry red for a few seconds, but don't dare soften much past the shoulder. It is dangerous and can lead to case failure as the softened brass tries to reharden itself.
Your best bet would be to measure once fired brass and create a chamber map. The brass will be a few thou smaller than your chamber due to springback, but bounce those numbers off SAAMI chamber specs. The pdf is free. There should be no reason for small base dies reloading for a bolt gun. Fun fact, auto and burst fire chambers are intentionally oversized, usually more at the base, to aid in extraction. If you are using such brass for reloads you must use a small base die, but expect to start tossing said brass due to over working and cracks in which there is no cure for.
@@PBVader I know all that and more . The question was will a small base die help with ( out of spec brass ) ? Been handloading for 48 years and to my recollection I have never ran into this issue ( out of spec brass ) . I bought lots of brass 25 to 35 years ago . I load 24 different cartridges and six wildcats . Maybe brass was better or more in spec back then ! Anything I could help you with ?……..
@@thomasdaum1927 NO. You can't help me with anything, right now. I gave you one instance of "out of spec brass" already. Here's another.
Your collection of antique brass is not going to show you signs of manufacturing corner cutting like new brass will. The formulation has changed, except for maybe a few year lots of lake city with military requirements. Some of this new brass will absolutely show early signs of future case head separation on the very first firing. Those go in the phukit bucket.
I've got 50 year old lake city and a pretty decent 45 Mongo load, but I've only been "reloading" for 8 years, after collecting enough tools and knowledge as the job did not allow the required allocation of time. I'll end by doubling down. There are out of spec chambers, out of spec brass and too many tools to rectify out of saami spec recommendations.
@@PBVader Eight years of reloading ( handloading ) ? Well you have a lot to learn Grasshopper !………. Good luck .
@@thomasdaum1927 I've actually learned quite a bit, from non-arrogant people willing to freely share their experience and always referencing safe load literature, even though the books don't always agree.
Yeh , quality control has definitely gone down on non premium factory ammo. Nothing new here…