How to Break In a Rifle Barrel Presented by Larry Potterfield of MidwayUSA
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- Опубликовано: 15 сен 2024
- Properly breaking in a rifle barrel is one more step in achieving the ultimate in rifle accuracy. Larry Potterfield, CEO and Founder of MidwayUSA, demonstrates one process for breaking in a new rifle barrel during this brief video.
For this and other MidwayUSA videos visit the MidwayUSA Video Library:
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I clean my rifle when the carbon and copper deposits increase the overall weight of the barrel by 1 to 2 pounds.
I shall try that! Good idea.
Ha!
Yeah, my rifle started life as a .308.
Didn't clean it until it became .22LR!!!
Currently it's a .243!😁
A heavy rifles a stable rifle, a stable rifles an accurate rifle.
LOL!
Every 5 shots for 50 rounds I think that is ridiculous
The idea of cleaning the barrel is to remove any of the powder fouling and carbon so the barrel can achieve copper equilibrium faster. The first few rounds remove minute particles and burrs in the rifling and it is important to to remove these particles between shots. This allows the copper to smooth over any microscopic imperfections.
Isnt that what proper machining supposed to do? If it's a cheap barrel I'm sure it's not honed out well enough, but if its a nice barrel its hardened and honed out to were this is just not going to do anything
@@michaelatkin9649 Even a lapped barrel can benefit from break in. Some of the best barrel makers still recommend a break in for their barrels. If it didn't have a benefit, I doubt they would.
I dont know how the laws are around the world are but in my country every firearm sold as brand new already has quite a few rounds thru the barrel to make shure it is safe. They fire them in a vise behind a blast shield with overcharged ammo and then every gun is carefully checked for micro cracks and alikes. This process would already have removed chips and burrs from the rifling if there ever had been any to begin with. I think barrel break in is Snakeoil. No one as far as im aware of has ever delivered definitive proof that breaking in a barrel has any benefits.
Break ins are snakeoil lol you guys got duped
@@1965l88yeah. Selling stuff we don’t need so they can make more money never happened before.
Larry this is not necessary. Your attempting to burnish the barrel but in the process your leaving behind some of the cleaning solvents which aid in lubrication. If you cleaned the barrel first then continued to shoot the powder residue leaves a degree of fouling that also lubricates a barrel from bullet jacket fouling. As a professional gunsmith and 5X US NRA National rifle champion, clean the barrel before shooting and just continue shooting. To that point I've installed a new barrel fired one shot to check the chamber, then went to the match the next day and fired 88 shots and winning the match as well. Cheers
Mitchell
The barrel needs to copper up to smooth IT out I can see 1 shot then 5 shots and that's it !
You do not have to clean it this guy in the video is stupid
After decades of only shooting handguns, I just bought my first rifle! A new Diamondback AR... The owner's manual recommends cleaning after every shot for the first 25 rounds. Then clean after every 10th shot up to 100 shots. Oy! Really? Any thoughts on this? Thanks.
He said to then run a dry cloth through it
@@mikerotch6733 That will still will leave a film in it .
Larry is one of the best gunsmiths in the world if not the best in my opinion, i have learnt so much from watching his gunsmithing advice and how to do things the right way.
Did he teach how to spell as well?
@@davidhunn5926 No, because if he did this man's grammar would be immaculate.
I use speak to text on my phone. And it messes up words doesn't put in proper grammar. But what do you actually think? I don't know how to spell and write. It's called, Speak to text speak to text people.
@John-jl4to sorry you are illiterate but what does that have to do with gunsmithing?
As a gunsmith, I enjoy these tutorials. Sometimes you learn something you never thought of.
I love these videos straight to the point with none of the BS in-between, the way it should be.
Good way to sell more ammo and cleaning supplies!
And 12 years later YT has finally decided to recommend me this video... Nice.
I bought a Winchester Featherweight .270 three days ago, put on a Leupold scope and followed the Barrel break-in recommended in this video. My first 3 shot group was less than an inch at 100 yds. with factory Remington ammo. Thanks for the video!!
Took my brand new tikka 270 to the range and put 5 bullets through the same hole and never "broke in" the barrel at all...let it cool and did in again and again..then i cleaned the carbon out of her cant wait to go again and see what she shoots....
somebody contact mythbusters and let them prove it
Hoppes #9 would work just fine while breaking in the barrel.
Thanks for Your Business!
Anyone who has a NEW rifle should listen to this information as part of the break-in-process.
Are you someone who takes good care of your stuff or do you "drive every possession like it is stolen"?
I like to take care of my personal stuff so it lasts a long time and remains in good condition all-the-while.
This is advice common 10 years ago. No one has ever proved that accuracy down the road will be any better by the one-shot and clean method. NO ONE!. For a factory gun just shoot it and clean at much longer intervals ~ 10 /20 rounds. It usually take 50- 100 rounds until peak accuracy can be expected.
I kinda thought so, cause I've never broke a barrel in like this and all my guns seem to be fine.
clean after every shot. Then after every 5 shots. rolmao way to sell some cleaning supplies on Midway Larry.
Pulling your brush back through the muzzle can damage your crown if: 1) You clean your rifle obsessively(ie over clean). 2) You use a brush who's base is not flush to your rod. This overhang can catch on your crown. I think about crown damage but don't worry about it. I pull my rod back through the bore. But I always use nylon brushes. I clean only when accuracy drops off. I de copper (using Dewey aluminum jags and Dewey aluminum/nylon brushes) even less than I clean carbon out. If my barrel is particularly nasty the first few cycles of brushing, I will not unscrew it. That takes too long and is a super pain. I just spray it quick with Brake Clean, then reapply some Hoppes with my needle bottle and draw it back through the bore. I inspect my crowns with a magnifying glass and never seen any damage..ever...using the above method.
@drottster I think that you can still achieve constant muzzle velocity if you follow the procedure mentioned by Mr. Potterfield. If anything, it doesn't hurt trying.
@MidwayUSA your website is pretty awesome I just bought about 70-80% of the parts I needed to build my latest AR from you guys. Only place I found with .300 blackout barrels in stock and I looked for weeks.
How come the owners manual doesn't specify such a procedure?
This does hone the bore and make it easier to clean and more accurate in the long run..
I bought some new rifles and decided to “break them in.” I could tell just doing it the first five times, that the barrel was way smoother and easier to clean by the 4th and 5th shot.
Took about 10 patches the first couple shots each. Now it takes about 2-3.
I was always told to NEVER pull the brush backward thru the bore.
Your fine pulling it back through. I have been cleaning that way for 45 + years, and have never had a damaged crown. You just do not want to stop with the brush still in the bore, end reverse it. That will cause the ends of the bristles to dig into the rifling.
At least Harry Potterfield didn't fall for that fallacy. I meant Larry, I get these two characters confused.
It's not about the crown or scratching the barrel.. it's about pulling the dirty fouling back into the groves of the barrel that you just pushed out.
Lee Smith You are not going to hurt a thing. That crud you just pushed out is mostly gone. As soon as those bristles of the brush flipped exiting the muzzle, the crud went with it. I have been cleaning that way for 45 years, and have never had an issue, and I have some custom rifles that are my long range varmint rigs, and the bore on them are perfect, and I run the brush through, then back through again. Now I only had to do this during the break in period. After that, just wet patched clean everything out. I have not run a brush through them in over 15 years. Now these are custom barrels, with a proper break in done, and they collect ZERO copper.
You will be fine pushing the brush through, then pulling it back through, but do whatever makes you feel better. I know what its like when I have BR shooters try to tell me how to clean my rifle, when i can out shoot them, so you do what you like. As long as its clean, you're all good.
Didn't say it would hurt the barrel, I said it was to keep from putting back material that you just pushed out.. Kinda like using a bucket of nasty water to wash your car.
@cacklin1 why not ? a barrel is a barrel, it doesnt matter what type of action is behind it.
I believe just normally shooting and cleaning the barrel will "break it in" just as well. Simply shooting copper (or plated) bullets will fill in the burrs etc. and increase accuracy. I really don't worry about cleaning all the copper out of my bores as I'm convinced leaving most of it in contributes to accuracy. jmho.
@Jrhoney i own a 700 sps tactical, and i can tell you that the rifle he is holding is different. for starters, the sps tac has a 20" barrel, where this appears to have a 24".
also, that is a HS-precision stock, not a overmold...the give away are the dual forward lugs for a bipod and sling, as well as the wider fore-end. also the overmold has texturing on the fore-end and grip.
@Sturmmann we use em on a farm and i love the old Mark 4 lee en-field smle there just so beautiful whether there oiled on the outside to store or when they have been battered by service like my dads mag is dented but we just dont care it adds charicter
Thanks Larry
50 rounds?? That sounds insane. Is there any evidence breaking-in a barrel helps with anything at all? I'm very sceptical.
David Cazes. I did this with method with my Savage 110FP .308 and my groups @100 yds were averaging .5 MOA With Hornady 308 WIN 155 gr. Match TAP ammunition. Wish I still had that rifle.
No. You have every right to be sceptical. Do not buy into any form of this money making myth. Watch gunblue490 for your logical gun info.
@@charlierich9840 After 50 rounds , I would't have any shoulder left. Can't afford all the fancy equipment he has .
@@alexbelle3941 you would have had a rifle just as accurate if you would have ran a dry patch down the bore, shot how ever many you wanted and clean like normal.
I don't agree with breaking in a barrel but I do agree that you need to clean your barrel before use and after each use. If, after manufacture, there are any bits of metal debris or anything like that in the barrel, you will cause damage to the inside and possibly affect accuracy by gauging it. However, I think the most important part of the barrel is the crown. Any damage to the inside of the barrel wont necessarily cause issues but damage to the crown probably will.
@Sturmmann agreed when we got a new lever action's on its first shoot we fired over 300 rounds between the guns and both are pinpoint accurate mine had rusting on its barrel due to blood and there are nicks in the varnish but it is cleaned regully cos it gets coverd in dirt and grass but when my dad got his he was so carfull his ended up more damaged
Never knew you had to break in a rifle... then again, i've never bought a new rifle. (i have many, many rifles). the only new rifle i ever received was a ruger 10/22, and ive probably put 30,000 rounds through it, not cleaning it until it jammed. (i got it when i was 4 years old) Nice video.
I'm Larry Potterfield and that's the fuckin way it is folks!
barrel break in is a myth...ive used multiple guns and tried doing it, and not doing it on different rifles....i don't think there is a difference in accuracy. as soon as you start shooting it and that copper fouling builds up your groups tighten up.
Nice grouping..after breaking in the barrel...Great advice there Larry Potterfield....They break in their cars..
I've heard pretty much the same thing Larry said from a dozen different people that are lifelong hunters and gunsmiths.
i was actually curious of this for my DPMS M-4, seemed like a full time job, called up DPMS customer service, and they said they have tested both ways, fire clean fire clean etc. or just running 20-30 rounds and then cleaning the rifle and gas tube, break down the bolt carrier assembly on both guns, give it a thurough cleaning, and bot still had the same accuracy, if you have a target rifle MAYBE. i'll go with what the manufacture tells me
There has never been a truly scientific test that barrel breakin process/procedures increase accuracy or increase longevity of a barrel. Most rifles are either accurate or they’re not right out of the box. Some need work to improve or enhance accuracy like bedding but most will let u know how
accurate they are within in the first several shots.
Yea always clean your new gun after every shot. Always. For 1500 rounds. And make sure you stop by your local sporting goods store and load up on cleaning supplies and ammo! No, 2000 Rounds. And get a bore snake too.
I always run another patch down the bore with a drop of oil on it.
You never want your barrel to get too hot. If you can hold your hand on the barrel without any discomfort then your good. If it's so hot that you can't hold on to it then you've over heated it. Just remember metal expands when it gets hot. If you heat it up too much and let it cool then it could cause imperfections or cracks in your barrel.
+Bunnyshooter 223 very good thought.
for my ar15s i just clean the bore once, lube the BCG, shoot 1000 rounds, clean/lube, shoot 1000 rounds, clean/lube, shoot 1000 rounds, clean/lube, ect.
Larry, modern barrels do not require a break in. Clean the barrel and action and then go shoot it. More damage is done frequently cleaning firearms than using them - this is coming from active military and neat freak who overcleans his guns.
@Sturmmann
With out using the proper tools you run a much greater chance of ruining the throat and/or the crown of your barrel, witch pretty much means the end of you getting the best possible accuracy out of your barrel
Brownell's smythbuster videos pretty much state the opposite of this. You can't really "break in" a barrel. They are almost all either 416SS or 41V50 CMV. Outside of making sure it is clean before shooting it the first time, you aren't really doing much of anything.
Thank you for the video .
@1994WN
Spot on. This break in thing then cleaning after every few shots is crazy. Go have some fun with a new rifle shot it.
Yall must not know that larry is literally the best gunsmith in the world and now u are calling him a liar just because you've never heard about properly maintaining your rifle
if you want the most accuracy, u break in the barrel. if you dont care how accurate your new rifle shoots, dont bother. these break in procedures help smooth out rough surfaces in your barrel. if you dont follow these cleaning procedures, you get a larger amount of deposits than you would normally get. but always use a bore guide. ive seen more damaged bores due to cleaning rods than anything else.
ok so I didn't do ANY of this for my M9A3 and I shot 100 rounds through it during one range day just wonderfully. I DID clean if after, though I needn't have since it was basically spotless anyway.
Hell Larry my last one was broke in 120 years ago...shoots 1.5 inch groups at 100 yards with iron sights...I've only bought 2 or 3 new ones in my life...I just get'em already broke in...
I never "broke in" the barrel of my weatherby and I'm getting good solid hits at a 3 inch target at 500 meters.
Although I do clean my rifle religiously.
@capnkirktm a brand new barrel has tiny imperfections and rough corners that are smoothed and evened out with the first shots. cleaning like this helps remove those particles from the bore
That's good to know, nice video!
I follow pretty much the same procedure, except with three shot groups instead of five, and allowing the barrel to cool between each shot.
me too! engineering student looking for a placement year here!
Think il just use a boresnake 2-4 times before shooting shoot 5 times then use a boresnake 2 more times and call it a day
We don't have any openings in the shop but we've got plenty of openings in other areas of the company - visit the careers page on our website or feel free to give us a call at at 1-800-243-3220. Our hours of operation are Monday through Friday 8 a.m. to 8 p.m. CT; Saturday and Sunday 9 a.m. to 5:30 p.m. CT.
Thanks for Your Business!
OK OK OK, Put it it in Reverse you all, I know this is a very old Thread. Just Clean the new Barrel when you get it. Clean it good.
and then Clean it one more time. This will remove any and all oil film or Manufacturing oil , packing and other such items that may be in the bore and chamber when you get your new Rifle.
Bring a heat gun to measure barrel temp at the end of the Chamber not the end of the barrel and only if you want to. But do time the Shots or let cool for a period of time Try to keep this time between shots about the same. Or the temp the same for the next shot. A timer works very good for this. Also bring another Firearm like a .22lr you can shoot to kill the time.
Clean or not between shots that is up to you.
This heating and Cooling or Expansion and contraction is what we seek. Steel likes to work harden. This is true for all steel. IE. Seasoned Engine Block and Heads meaning use and heat cycled hold there shape better than new metal that has not been heat cycled. We are looking for a Stable Bore size. Or for a Engine a Stable O funny a Stable Bore size.
I also recommend that you Cryogenic your barrel if you can. But it is not easy with Pinned Barrels or having to reset head space. AR Type Barres are Easy or 10/22 are easy. Savage is not that easy or Remington 700.
Or like some say do what ever makes you feel good. Barrels are great or not.. Some will never shoot good, Some we never want to get rid of. Firearms are like food some time you get a great meal and the next time you go back to the same place and order the same meal, you do not get the same great meal as last time you ate there.
Firearms are, pun here, a hit or miss item, Purchase 5 of the same product number and in the end you will be able to rate them from best to worst for your desired needs.
Each of us do what we feel is best for the Items we Purchase and in the end that is how it should be.
Remember Larry is in the Business of Selling. He Sells the Guns, the Cleaning Supply's, the Ammo the lead sled and I can go on but you do get the point about Larry's Video, Right? If not he Sells for a living. Cars or Guns and related products,
Actually, "break-in" for cars and motorcycles is recommended - without changing anything, of course (maybe oil once). Some time on idle several times, then some miles on limited speed each day for several days. This way it serves longer.
Larry, what about concerns about pulling the brush back through after it leaves the muzzle?
Cant beat a Bore Snake for a quick efficient cleaning.
did....did we just have a midway usa video where we are not told the make, model, caliber, and vintage of a firearm? what have they done with the real Larry Potterfield?!
This is basically the way I was taught to break in a barrel.
All of my rifles are very accurate.
But to be fair and honest, I have nothing to compare it to, since I never did anything differently.
Could breaking in and zeroing be down at the same time ?
Yes
I rub chicken entrails on my bullets first, THEN and only then, can they be loaded into the chamber BUT ONLY by a left handed lesbian dwarf amputee, during a hail storm. If you're at a latitude greater than N 32.217, it's gotta be a MINORITY lesbian dwarf amputee...
LMAO!!
LMAO
+Imustfly You think this is funny but i know someone who did not take the time to do this and ruined there bbl withing a few hundred rounds from copper fowling, it was a model 70 winchester in .270 wby. mag. however i think one box of 20 shells will do for inital break in, clean and shoot first 5 rounds one at a time, then do five 3 shot between cleaning and call it good. this is more critical for hot overbore magnums, something like a 30-30 probably wont mater so much.
This is the funniest RUclips comment I've ever read
+rusty nuts Dammit man.
for best accuracy, i think "corect" break n should be done, there is nothing to loose except maybe 1hr
it comes down to do you the best accuracy your gun cn shoot? and can you be stuffed doing it..
me ive done it on all of my rifles and not one shoots over 1moa (most are sub 1/2 inch)
heck my varmint .308 i only put max 6>8 rounds before cleaning it, even tho its broken in and its a .3 inch or less rifle almost every day
to me it just depends on how serious you are about shooting
And that’s the bottom line because Larry Potterfield said so!
@dmesz311 brass is softer than the steel that the rifle is made of so your not going to do any damage to the bore
Exactly, what's the purpose of cleaning after the first shot. It's a factory gun ...the throat is full of burrs of which...only lots of rounds will smooth them out.
This video could have used a description of what this procedure actually does, and what allegedly happens if you just shoot instead
larry must really like his remmys, in almost every video i see about rifles he is hefting a 700. ill take my ruger larry, got much aftermarket for it at midway?
AK-47 Break in: disassemble, remove ALL cosmoline embalming fluid...
6 hours later...
Run a piece of your tee shirt through the bore. Fire 2 two rounds to make sure the barrel is straight. Remove mag, pull back bolt and trow in a handful of dirt/sand. Find a puddle swishing it around to remove dirt/sand. Pour used motor down the barrel, and run another piece of your tee-shirt down the bore. Fire 40 rounds into the sky. Join others in downtown Cairo.
...and thats the way it is!
thanks guys
@kyle1058 I have a 10/22 too...never cleaned it...not even a little bit. It's the straightest shooting gun I've ever had.
Thats a really nice rifle Larry's got there. I'm guessing its a Remington 700. I really like the stock, anybody know what kind of stock that is?
@subhunter672 What ? Cleaning the barrel doesn't wear it out, the brass brush is far softer metal than the barrel is. Its not like shooting a bullet is.
i think you will find he will use more patches then it shows, you want to shoot with a dry clean barrel or defeasts the purpose of cleanign it
Love your videos. Very informative and well made. I do think you should change your name to "Smiley" =) Keep up the good work!
Larry, what's your opinion on the David Tubb Final Finish method? I've bought a lot of these kits in different calibers from Midway USA and was pretty happy with how they performed in my Remington 700 BDL .30-06. Accuracy seemed to improve, and cleaning was certainly easier after using these products as directed. Do you have an opinion on these products?
@prayfortruejustice Ha ha ha ha ha ha ha. That just made my day. Funniest thing I have heard in a looooong time. Love the humor. Especially the "Join others in downtown Cairo" line and "and thats the way it is. I see you've watched Larry before. LMAO.
I thought breaking in a barrel was just a myth. I don't see how this would improve a barrel. All I do is clean it before my first shots. Use good ammo for your first 20-50 rounds (or more) and let it cool after about 5 rounds before shooting again. You don't wanna use crap wolf ammo on a brand new barrel and heat your barrel to 200 degrees lol. Just make sure you let your barrel cool a good bit before shooting and after the range field strip it and clean the shit out of it.
Deez Nuts
Tell me this, wouldn't you want your hunting rifle to shoot as accurate as possible also? This break in is needed. And to TJ4774, barrel break in is not a myth. When I started shooting, I did not know any of this, and had barrels so full of copper, I could not keep groups inside of 2" at 100 yards. Tried cleaning the copper out with copper solvents, and they just made things worse. Once I learned, and I learned this exact sequence that Larry teaches, I have 3 varmint rifles now that NEVER collect any copper, and after the break in, they only need wet patches followed by dry patches. No brushing needed because the bore is so smooth, there is no need for scrubbing anything. And, my best bore cleaner is the good old stand by Hoppes #9. Copper cleaner never touches the inside of my bores. BR shooters use it for fast cleaning, but many of them will go through 2-4 barrels per year. If you plan to keep your rifle awhile, stay away from any cleaner than has ammonia in it. Many of the top cleaners were tested along side Hoppes #9, and it cleaned the best over all. Even cleaned copper better than most copper cleaners.
pickin4you No not really, because the average hunting shot is 100 yards...And a kill shot above the shoulder is about 3 MOA wide. And most target guns sacrifice weight for accuracy.
I guess it depends on the barrel. My Remington 500 5r is shooting 1/2 moa and my break in process was to shoot the gun until I ran out of ammo then cleaned it :) For the most part, I just use a bore snake between trips to the range until it's time for a full cleaning.
Deez Nuts
There are MANY varmint hunters out there, so a 3 MOA group on a groundhogs head, and you pretty much guarantee yourself a miss. My Remington 700's will shoot sub 1/4" groups. You do what you want with your gun, but the process Larry has shown is the CORRECT way to break in a barrel. Any other way, and you risking the money you have in your rifle. Don't know about you, but I do not have money to pay over $700 for a rifle, then spend another $400 to have a custom barrel installed after I ruin the first one by not breaking it in properly. If you've got the money, then don't break them in. Just treat your rifle like junk and shoot the crap out of it.
The first round is the only one you need to "break it in". Then clean once. Now it's ready.
It's called Tipton Truly Remarkable Bore Cleaning Solvent 5 oz Liquid, and is product number 178747 on our website. If you have any additional questions or comments, please feel free to contact us at 1-800-243-3220. Our hours of operation are Monday through Friday 8 a.m. to 8 p.m. CT; Saturday and Sunday 9 a.m. to 5:30 p.m. CT.
Thanks for Your Business!
Wow, this takes the fun out of shooting!
Just purchased a new Sako Gray Wolf. Thank you for the Information .
1 box of 20 rounds is more than enough to break in. Clean before firing, than after each of the first 5 shots, than do three five shot sets cleaning after each.
Are you sure that 6 hours is enough for cosmoline removal?
I have heard both sides of the break in controversy. My opinion is why not break it in the way that Larry says, it can't hurt and if it does deliver tighter groups, you have spent your time wisely. While I am not a competition shooter, if I have a better chance of making a clean kill then, I'm all in favor of doing whatever it takes.
Great video...we'll do.
@Mchermsquatch its not, all the gunsmiths that ive talked to have told me to run approx 40 rounds through a rifle then clean, and it should be broken in by then
How to remove my TacStar stock from my Rugar .22LR 50th anniversary so I can clean it without breaking anything, An I'd love to know a quick fix for the sling swivel studs that hardly ever aligns up an afraid of turning it to match up with top an bottom studs so my slings not all twisted?
For people who say break in is a myth and they didnt do it and group just fine. What if you had taken the time to do it and group .5" tighter?? Worth it IMHO.
Ω
@jacob541146
I understand that, but even the cheap stuff is $20 a box. Considering I'm trying to feed a 9mm, .40, and .45, a .223, and now the .308, groceries is kinda slim :).
I've been shooting for a long time, but it's only recently that I've heard of properly breaking in a barrel. I was aware of the need to clean a barrel prior to first firing, but the rest is new to me. Can you provide an explanation, or produce another video, or refer me to another video or website that explains exactly what is gained by the process of shooting and cleaning that you outline? I'm not a doubter per se, but would welcome the rationale and technical explanation for the process. TY
Do your own research! Don’t except old Larry to spend his time doing your homework!
im larry potterfield,and thats the way the cookie crumbles
Is there any reason to use a rod to clean your barrel instead of a rope cleaner like the Boresnake?
The cost of a firearm my guess is it should already be broken in ready to go for the customers
The only thing I dont like about this is the bristle brush...i'd prefer just using patches, even extra patches vs using the brush
what would u recomend doing to a remington 700police medium long range sniperrifle to improve accuracy? would you recomend changing the bolt?
@werewolf88999 It actually is scientific. Clean it first to make sure its free from oil, the shoot it. The first bullet will smooth and or fill tiny imperfections in the bore surface. Clean it again and repeat. What you are doing is controlled wear in of the rifled inner surface till it is uniformly smooth. Im a noob but that is how I understand it. And you dont want oil for break in because it will cause uneven wear in bore, and that lessens accuracy. Hope this helps a bit, but Im no expert.
How long for the barrel to cool properly?