Is something magic about 28" finished length for 6BR / BRA
- Thread starter prone.life
- Start date
Barrel Length and Velocity — Barrel Cut-Down Tests « Daily Bulletin
Many of our readers are in the process of building 6mmBR rifles, or re-barreling their guns to this efficient, accurate caliber. Project builders often ask us: What length barrel should I use -- How much velocity will a 30-inch barrel deliver vs. a 28-inch? Well, here's the answer, based on...
My current 6bra is 28”
It’s replacement is 30”
FNSafari
Gold $$ Contributor
If your barrel comes 28", they you need to cut an inch off the back and front ends before chambering to get rid of any lapping damage, or just run it as is and take your chances.
Hoekight
Silver $$ Contributor
You don’t have to cut an inch off the chamber end. The outside gets threads cut in it the inside gets a reamed for the chamber. I’m pretty sure lapping damage is irrelevant under the reamer.
Liven The Dream
Gold $$ Contributor
Well 2 cents here 2 Dashers Same Barrels Brux 30" 1-7.5
One shoots 8ths of a grain less and groups equal at 600 yard?
All is not Equal.
I just finish up a 6BR Bartlien 1-8 Barrel 27" Match Reamer .270 Neck.
Will see how this Dream Works ?? 105HB and 107 Sierra Pills on Varget .
One shoots 8ths of a grain less and groups equal at 600 yard?
All is not Equal.
I just finish up a 6BR Bartlien 1-8 Barrel 27" Match Reamer .270 Neck.
Will see how this Dream Works ?? 105HB and 107 Sierra Pills on Varget .
Got 1-30 & 1-31" , both Hvy Palma, .900 at muzzzle,longer is Always better lol
coldboreshot
Silver $$ Contributor
Well that's interesting considering I have my 6br finished at 29" and it's a laser beam.
coldboreshot
Silver $$ Contributor
.272 neck (Lapua brown box brass light turn), 104 freebore (Berger 105 vld). 1-8 tw. Don't think it would make much difference running BRA.
A competitor complained that His 30” match barrel would not group. A veteran/knowledgable rifle smith suggested,”cut that barrel back to 27” and it will shoot”. I don’t know???
Liven The Dream
Gold $$ Contributor
30" barrel won't shoot ??? The door is open to many questions.
Start with : Barrel make, Gun Smith, Loaded Ammo and the Shooter ?
Well my 27" 6BR Barrel shoots light out at 600 yards? VooDo magic?
Ccrider
Gold $$ Contributor
Every barrel is different. It’s more about particular barrel harmonics than length.
Also, a bad chamber job, bad crown etc will not shoot good at any length. Add to that, one’s ability to tune, which includes selecting the best bullet, powder primers etc.
Anecdotally, I have seen where some of the top shooters have cut an inch off of a barrel and it came alive. But they never say that barrel length was the problem.
Also, a bad chamber job, bad crown etc will not shoot good at any length. Add to that, one’s ability to tune, which includes selecting the best bullet, powder primers etc.
Anecdotally, I have seen where some of the top shooters have cut an inch off of a barrel and it came alive. But they never say that barrel length was the problem.
Well, the smith wasn’t “wrong” in Your case
Liven The Dream
Gold $$ Contributor
109 Burgers in a 30” Dasher more Magic?
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