how much will barrels "speed up" when broken in?

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by the444shooter, Oct 2, 2018.

  1. the444shooter

    the444shooter Well-Known Member

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    I bought a Remington 6.5 creedmoor that shoots lights out with 140gr American Gunner factory ammo. The stated velocities are 2690 for a 24" barrel. The gun has a 22" barrel, so I know it might be a tad slower, but the velocities I got from my magnetospeed were 2500-2534 in a 5 shot string. The gun only has about 30-40rds through it so far. How much more can I anticipate the barrel speeding up as it gets broken in? Is 100 fps outlandish to hope for?
     
  2. Rick Richard

    Rick Richard Well-Known Member

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    Each gun is different along with barrel length, but I would say anywhere from nothing to 100 maybe fps
     
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  3. Heavyiron

    Heavyiron Well-Known Member LRH Team Member

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    X2 on what mr richard said
     
  4. the444shooter

    the444shooter Well-Known Member

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    Thanks for the replies
     
  5. jasonco

    jasonco Well-Known Member

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    If you don't yet reload, this is very good cartridge to learning to reload with!
    24" barrel length, is kind of the mid-length, length and you can get to the 2750's fps with hand loading 140-143 bullets, with many many powders. H4350 is, of course, the magic Unicorn Fairy Dust powder(I just got another 10lbs of it!) as always but, Reloder 17 matches really well with 24" barrel and 140-143 grain bullets.
     
  6. the444shooter

    the444shooter Well-Known Member

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    Thanks Jason, I plan on loading for it in the future. The factory American Gunner shot so well in it I thought maybe I’d just shoot that, but then I saw the velocities. Gonna go out in a sec and test the same ammo in a 24” Bergera
     
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  7. jasonco

    jasonco Well-Known Member

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    By all means, keep using the American Gunner, I do and it's good stuff, in my bolt guns. It's not the fastest but, it's pretty dang accurate for the price.
     
  8. the444shooter

    the444shooter Well-Known Member

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    The Bergara showed anywhere from 2580-2614, so still 80-100fps slower than advertised. I've notified Hornady, and we'll see what they do.
     
  9. DrillDog

    DrillDog Well-Known Member

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    You can't "expect" a barrel to speed up after break-in. It may or may not. Depends on how rough the bore is to begin with. They usually speed up a little after about 100 rounds, but 100 fps gain after break-in is an outlandish expectation.

    The real benefit of break in is that you should start to see more "consistent" speeds (at least with a well tuned handload) and the barrel will clean out easier. A well broke barrel can also usually shoot more rounds before requiring cleaning due to degraded accuracy.

    Any factory ammo is a crap shoot for meeting stated velocity as every barrel is a little different. Other part is I think ammo companies exaggerate velocities on their boxes to get more sales. Doesn't matter how much a person complains after seeing the truth on a chronograph because you can't change factory ammo. Most people who shoot factory ammo dont own a chronograph so they just believe what's listed on the box. If you are unhappy with the velocity, best thing to do is start handloading your own ammo. Of course, accuracy is what really matters.
     
    Last edited: Oct 3, 2018
  10. dfanonymous

    dfanonymous Well-Known Member

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    I think you can expect a barrel to increase velocity. Copper build up will always insure that. After a few hundred rounds, most barrels will have a balance out for a bit and you’ll have some consistancy in the barrel for a few hundred rounds before the next increase. Then there will be so much copper build up that accuracy is effected and you’ll have to get it out. I love when my patches come out blue.
     
  11. jasonco

    jasonco Well-Known Member

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    That's about the right velocity with the Hornady American Gunner 140 BTHP ammunition.