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Barrel Speeding Up? #8026691 10/28/20 01:27 AM
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How much would you expect a quality barrel to speed up as it breaks in? I have gained 65-70 fps in about 150 rounds. This seems excessive to me but I could be wrong. It’s also too fast. 7-08 with 162 Amax running 2750 out of a 22” barrel. Zero pressure signs. The speed up was actually between 100-150 rounds on the barrel.

Re: Barrel Speeding Up? [Re: wp75169] #8026698 10/28/20 01:29 AM
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That's pretty common also most don't trust speed until after there's 200rds on a barrel.


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Re: Barrel Speeding Up? [Re: wp75169] #8026968 10/28/20 03:33 AM
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It is very common for high quality cut rifling barrels to speed up after about 75-150 rounds, depending on the caliber. I’ve seen personally multiple competition rifles speed up during this time, even during a match. You have to account for that.

It’s also hard when developing a load for a brand new rifle and you are 75-100 FPS slower than where it should be. The customer doesn’t understand it, but I tell them it will speed up after the barrel gets seasoned in, and they always do.


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Re: Barrel Speeding Up? [Re: ChadTRG42] #8027288 10/28/20 01:26 PM
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Originally Posted by ChadTRG42
It is very common for high quality cut rifling barrels to speed up after about 75-150 rounds, depending on the caliber. I’ve seen personally multiple competition rifles speed up during this time, even during a match. You have to account for that.

It’s also hard when developing a load for a brand new rifle and you are 75-100 FPS slower than where it should be. The customer doesn’t understand it, but I tell them it will speed up after the barrel gets seasoned in, and they always do.

Didn't know this I'll have to recheck a few rifles.

Re: Barrel Speeding Up? [Re: wp75169] #8027315 10/28/20 01:37 PM
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Sounds like I need to put some more rounds down range. Saturday mid match I went from low at 3.0 to high at 2.9. I got the velocity change from running the numbers. I’m confident in my scope and mount. If it ever quits raining I’m going to run it across the crony, clean, foul, crony again.

Re: Barrel Speeding Up? [Re: wp75169] #8027329 10/28/20 01:45 PM
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Chronograph is new to me. Is the speed up observed in most rifles? Button rifled barrels?


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Re: Barrel Speeding Up? [Re: redchevy] #8027346 10/28/20 01:52 PM
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Originally Posted by redchevy
Chronograph is new to me. Is the speed up observed in most rifles? Button rifled barrels?



I would assume any that are not extensively hand lapped. ASSuME. Yeah, I assume.

Truth is most rifles never see 100 rounds. People buy ammo, sight in, hunt. Might take 20 years to see a speed up that way.

Re: Barrel Speeding Up? [Re: wp75169] #8027367 10/28/20 02:01 PM
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Yup. Not uncommon. As dee said, I don't trust em until they have 200 rounds down em.

I had a .260 Rem that gained 100 fps shooting 130's from a 24" barrel.


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Re: Barrel Speeding Up? [Re: wp75169] #8027390 10/28/20 02:08 PM
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Originally Posted by wp75169
Originally Posted by redchevy
Chronograph is new to me. Is the speed up observed in most rifles? Button rifled barrels?



I would assume any that are not extensively hand lapped. ASSuME. Yeah, I assume.

Truth is most rifles never see 100 rounds. People buy ammo, sight in, hunt. Might take 20 years to see a speed up that way.

Unfortunately i fit the bill for that now. A few years ago i shot hundreds of rounds a year through multiple rifles, now i just dont have the time. Building where i will have a 500 yard strip out my garage window, hoping it changes soon. Been hunting on the same group of 20 hand loads in my 270 for more than the last 5 years, still have 6 rounds left but have killed deer with it every year.


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Re: Barrel Speeding Up? [Re: wp75169] #8027476 10/28/20 02:55 PM
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Do you guys retweak your loads for optimum accuracy to account for the speed increase?


Originally Posted by onlysmith&wesson
I was wrong...on anything technical.

Originally Posted by Sailor
Fitz............. is right, ya know............
Re: Barrel Speeding Up? [Re: Big Fitz] #8027488 10/28/20 03:00 PM
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Originally Posted by Big Fitz
Do you guys retweak your loads for optimum accuracy to account for the speed increase?



I will be. Probably 50 more rounds then start over load development. It’s actually shooting great still, if the nut behind the wheel could understand wind it would be competitive as is.

Re: Barrel Speeding Up? [Re: Big Fitz] #8027494 10/28/20 03:06 PM
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Originally Posted by Big Fitz
Do you guys retweak your loads for optimum accuracy to account for the speed increase?


I do not see a change in accuracy from the original load. The barrel just speeds up.


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Re: Barrel Speeding Up? [Re: ChadTRG42] #8027498 10/28/20 03:09 PM
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Originally Posted by ChadTRG42
Originally Posted by Big Fitz
Do you guys retweak your loads for optimum accuracy to account for the speed increase?


I do not see a change in accuracy from the original load. The barrel just speeds up.


Typically my experience as well. Just recently had one that the accuracy was still one hole bht the point of impact shifted a good bit.


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Re: Barrel Speeding Up? [Re: wp75169] #8027544 10/28/20 03:37 PM
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Yes, you will have a POI shift, generally high. That's what I meant by account for it, and re-zero or adjust.


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Re: Barrel Speeding Up? [Re: wp75169] #8027556 10/28/20 03:45 PM
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This is news to me because quality barrels are something new to me too.

I assume what some of yall say is true, and seems feasible to me. The only explanation I have that is there is less friction as the first couple hundred-ish rounds kinda smooth out all the microscopic imperfections in the bore. Just a theory and if it's true, then I'd imagine that barrel which are had lapped would see LESS velocity increase within the given conditions.

Has anyone noticed if a high quality, cur-rifled barrel that has for sure been hand lapped see the same the velocity increase?

Edit: I understand the hand lapping process of barrels to be getting a lead negative of the bore and then working it back-and-forth with some lapping compound. I may be wrong on this.

Last edited by Korean Redneck; 10/28/20 03:47 PM.

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Re: Barrel Speeding Up? [Re: Korean Redneck] #8027574 10/28/20 03:59 PM
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Originally Posted by Korean Redneck
This is news to me because quality barrels are something new to me too.

I assume what some of yall say is true, and seems feasible to me. The only explanation I have that is there is less friction as the first couple hundred-ish rounds kinda smooth out all the microscopic imperfections in the bore. Just a theory and if it's true, then I'd imagine that barrel which are had lapped would see LESS velocity increase within the given conditions.

Has anyone noticed if a high quality, cur-rifled barrel that has for sure been hand lapped see the same the velocity increase?

Edit: I understand the hand lapping process of barrels to be getting a lead negative of the bore and then working it back-and-forth with some lapping compound. I may be wrong on this.


My Obermyer which is lapped by them then again by my smith never showed a change. That was cut rifling. Barrel in question is a Proof Research cut rifling. No notes on lapping ever. I can dang sure say it’s speeding up where the other one didn’t.

Re: Barrel Speeding Up? [Re: Korean Redneck] #8027601 10/28/20 04:13 PM
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Originally Posted by Korean Redneck
Has anyone noticed if a high quality, cur-rifled barrel that has for sure been hand lapped see the same the velocity increase?


Bartlein barrels are precision cut rifled barrels and hand lapped. Their barrels, specifically, will speed up. Kreiger barrels will also do the same (the guys at Bartlein left Kreiger to start Bartlein, so it's nearly the same mfg processes). I can assure you that there is no "if it's true" or "seems feasible" going on. That is what they do. I have seen it MANY times. If you are a precision shooter and run one precision load with the same ammo lot, you will notice it. I'd say 99% of shooters do not have the ability to see this if they are running factory ammo or change to another ammo and make the adjustments to the new ammo. The loose tolerances of factory ammo would be difficult to notice it. But when you run one specific load with no changes, you will see the POI shift in your zero and see your trajectory flatten out.


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Re: Barrel Speeding Up? [Re: ChadTRG42] #8027636 10/28/20 04:33 PM
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Originally Posted by ChadTRG42
I can assure you that there is no "if it's true" or "seems feasible" going on. That is what they do. I have seen it MANY times.


Like all phenomenon that is new to me, I approach it high levels of skepticism at first so I will still only assume this to be true. Ain't nothing personal, everyone can and has been wrong before about everything. haha.

Jokes aside, it didn't seem theoretically impossible at first thought. Hence the question. From a pure-scientific nerd stand point, I'd love to see a little informal study of velocity gains vs level of hand lapping. At the very least, wp has at least one counter example. It's probably a worth-less endeavor but something like get a bunch of barrels with varying number of passes of lapping and see if it correlates to the change in velocity.


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Re: Barrel Speeding Up? [Re: wp75169] #8027669 10/28/20 04:55 PM
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I've seen it in bartlien, krieger and mullerworks on my personal stuff. On a friend's benchmark that is a button barrel. All are considered pretty high-end and sold as hand lapped.


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Re: Barrel Speeding Up? [Re: dee] #8027735 10/28/20 05:42 PM
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Originally Posted by dee
Originally Posted by ChadTRG42
Originally Posted by Big Fitz
Do you guys retweak your loads for optimum accuracy to account for the speed increase?


I do not see a change in accuracy from the original load. The barrel just speeds up.


Typically my experience as well. Just recently had one that the accuracy was still one hole bht the point of impact shifted a good bit.


Yup


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Re: Barrel Speeding Up? [Re: wp75169] #8027755 10/28/20 05:54 PM
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Is this only for cut rifle barrels? Just wondering if it applied to button or hammer forged.



Re: Barrel Speeding Up? [Re: wp75169] #8027771 10/28/20 06:07 PM
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I've seen it in benchmark button barrels. No experience on Hanmer forged


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Re: Barrel Speeding Up? [Re: Korean Redneck] #8027819 10/28/20 06:37 PM
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Originally Posted by Korean Redneck
Originally Posted by ChadTRG42
I can assure you that there is no "if it's true" or "seems feasible" going on. That is what they do. I have seen it MANY times.


Like all phenomenon that is new to me, I approach it high levels of skepticism at first so I will still only assume this to be true. Ain't nothing personal, everyone can and has been wrong before about everything. haha.

Jokes aside, ...


My momma said if I can't say anything nice, then don't say anything at all. I'll bite my tongue on this one. But I will say this, there's a few things I've been wrong about. But not this one.


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Re: Barrel Speeding Up? [Re: wp75169] #8027827 10/28/20 06:39 PM
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Re: Barrel Speeding Up? [Re: wp75169] #8027912 10/28/20 07:43 PM
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I don’t think I’ve ever owned one that didn’t. At least not one I ever noticed. I don’t trust any reading until I get over 100 rounds on a barrel.


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