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Barrel break in

 
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  #1  
Old 05-11-2013, 04:00 PM
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Barrel break in

Guys my new Creedmoor is shooting lights out but my chrono results are interesting. The barrel is a Bartlein 1in8 twist 5r and Ive put 50rds through it so far with the 140 Hybrids on top of 43.5gr of H4350. Did a proper break in of shoot and cleans for 7 rounds at wich point the copper completely stopped. I am just wondering when it will settle in as far as velocity goes? I thought I would have reached that point. My Brux started shooting duplicates over the chrono around 35 rounds.
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Old 05-11-2013, 04:08 PM
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Re: Barrel break in

It might change a little in velocity out to 100 / 150 rounds. But it should be consistent now. Are you seeing large ES between shots? If so move your chrono out to 18' from the muzzle.

Jeff
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Old 05-11-2013, 04:59 PM
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Re: Barrel break in

Actually Im seeing duplicates of diffrent velocities for example 2825 duplicate 2844 duplicate and the last to went 2835 duplicate so I am thinking its my chrono. Thank you for fast reply Broz
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Old 05-11-2013, 05:37 PM
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Re: Barrel break in

Any other advice on chrono setup Broz. I think my velocity should be a bit higher do to my tube being 28" long. I was thinking around 2850+
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Old 05-11-2013, 06:38 PM
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Re: Barrel break in

No, just set your chronograph out at 18' from the muzzle. I would not get to concerned about what you see for numbers yet. I have had many chronographs lie to me over and over, especially less expensive units. That is until I bought an Oehler 35. Working out drops to 1000 yards will give a better idea of real velocity. The proof is in the pudding.

Jeff
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Old 05-12-2013, 06:34 PM
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Re: Barrel break in

Usually a Bartlein doesn't require much break in! You are probably where you are going to be, whatever that is........rich
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  #7  
Old 05-12-2013, 08:58 PM
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Re: Barrel break in

Unless your barrel's got the same chamber, bore and groove dimensions as the one the load recipe was developed with, your muzzle velocity can easily be 50 fps faster or slower than the data claims.

And your powder and primer lots are not the same as what the load was developed with. This will often change chrono'd loads 25 fps different than what the manual says.

Even with two people shooting the same rifle and ammo, a 25 to 50 fps difference in average muzzle velocity happens a lot 'cause the rifle's not held the same way by each shooter.

It's rare that anyone duplicating a published load gets the same muzzle velocity quoted for it. Even allowing for a 25 fps change for each inch of barrel length difference.

Quote:
Originally Posted by Broz View Post
Working out drops to 1000 yards will give a better idea of real velocity. The proof is in the pudding.
It's possible, but how does one compensate for the inaccuracies of virtually all scope adjustment values per click? All internally adjusted scopes of a given make and model do not have exactly the same amount of impact change per click. To say nothing about the atmospheric conditions between the rifle and target that'll change the bullet's drop and there's no way you can measure them when the bullet's fired.
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