I ordered a Brux barrel the other day for my switch barrel it is a 6mm barrel and I'm going to have it chambered in 6x47 lapua. When I ordered it I explained how I would like to shoot bullets as small as 70gr up to 100gr I would like to be able to hunt deer and coyotes with it. And I was leaning toward a 9 or 10 twist and he recommended an 8 so I went with his advice. But now I'm having second thoughts will an 8 twist be to fast for the 70 gr bullets I would like to shoot will they fly apart due to such a fast twist or will they work out. Right now in my other 6x47 I'm pushing 69gr Bergers to 3630fps and I'm thinking I'm going to be getting somewhere around the same velocity out of the new barrel.
Barrel twist rate
- Thread starter devildogg
- Start date
wdchuckhuntr
New member
Although I suspect you'll be just fine with the lighter bullets why not stick with the heavier ones? I'd almost think the bigger issue will be the throat distance of the new barrel being designed for heavier (longer) bullets. You may be jumping lighter bullets quite far.
I really wanna stay with my 69gr Bergers for yotes they have made me very happy over the years. They r extremely accurate they seem to buck the wind as well as any heavy bullet out to the distances I am shooting. If I were shooting out to 600yds for predators I would probably stick with the heavies. But for my self I have only shot one that exceeded 500 and consider myself lucky to have hit him usually most of my shots are right around 200yds. But I would like to shoot some heavy hunting bullets for deer and the heaviest bullets I would shoot for deer would be the 100gr hornady interlock or the 95gr nosler ballistic tip. I went to the 6br website and I could only find where they talked about the 6br with an 8 twist and they were using a 24-26" barrel I believe. I had talked to several other people and they thought I would be on the threshold of popping bullets with the speed I would be pushing the smaller lighter bullets. But I think I'm going to take your guys advice and stick with the 8 the guy at Brux said if it didnt work he would take the barrel back and give me another one but I just don't want to have to wait another 5 months and pay another $300 for chambering. If I would have won the lottery the other night I wouldn't care I just don't like to wait and have to fork over another $300.
joed
New member
If you want to shoot the 69 gr than I'd have stayed with the 9 or 10.
I learned my lesson years ago with the .223. A fast twist barrel is generally designed to shoot the heavy bullets. Light bullets just don't do as well because of the long jump to the lands.
The .223 I owned had a 1:9 twist. It could shoot the 69 gr match bullets into a ragged hole but 50 gr or lighter shot 2" groups. Unfortunately I bought the rifle for groundhog hunting and wanted the light bullets so I wouldn't have to worry about ricochets. Gave up and sold it.
I learned my lesson years ago with the .223. A fast twist barrel is generally designed to shoot the heavy bullets. Light bullets just don't do as well because of the long jump to the lands.
The .223 I owned had a 1:9 twist. It could shoot the 69 gr match bullets into a ragged hole but 50 gr or lighter shot 2" groups. Unfortunately I bought the rifle for groundhog hunting and wanted the light bullets so I wouldn't have to worry about ricochets. Gave up and sold it.
Originally Posted By: joedIf you want to shoot the 69 gr than I'd have stayed with the 9 or 10.
I learned my lesson years ago with the .223. A fast twist barrel is generally designed to shoot the heavy bullets. Light bullets just don't do as well because of the long jump to the lands.
The .223 I owned had a 1:9 twist. It could shoot the 69 gr match bullets into a ragged hole but 50 gr or lighter shot 2" groups. Unfortunately I bought the rifle for groundhog hunting and wanted the light bullets so I wouldn't have to worry about ricochets. Gave up and sold it.
That's funny.
Travis
I learned my lesson years ago with the .223. A fast twist barrel is generally designed to shoot the heavy bullets. Light bullets just don't do as well because of the long jump to the lands.
The .223 I owned had a 1:9 twist. It could shoot the 69 gr match bullets into a ragged hole but 50 gr or lighter shot 2" groups. Unfortunately I bought the rifle for groundhog hunting and wanted the light bullets so I wouldn't have to worry about ricochets. Gave up and sold it.
That's funny.
Travis
2muchgun
New member
Yep, couple of things "wrong" with that statement.
As for 6mms, if you never want to shoot over 100gr bullets, or want to shoot 69gr or less, exclusively, nothing more than a 1-10 is needed. You will gain nothing going with a faster twist.
Generally speaking, I'm a fast twist guy. But I'm generally a heavy bullet guy also. That said, shooting a faster twist than necessary doesn't affect hunting rifle accuracy enough to matter IME, but velocity will be a touch less, and so will barrel life. Pressures are also greater.
Barrels are like tires IMO anyway. I go through plenty of both...........
As for 6mms, if you never want to shoot over 100gr bullets, or want to shoot 69gr or less, exclusively, nothing more than a 1-10 is needed. You will gain nothing going with a faster twist.
Generally speaking, I'm a fast twist guy. But I'm generally a heavy bullet guy also. That said, shooting a faster twist than necessary doesn't affect hunting rifle accuracy enough to matter IME, but velocity will be a touch less, and so will barrel life. Pressures are also greater.
Barrels are like tires IMO anyway. I go through plenty of both...........
ARCOREY
New member
I was in a similar spot a few years ago with my 243win with a weight range of 70-100gr and the ideal being 87gr. I went 1-9" and haven't shot anything heavier than an 87 Berger VLD since and probably won't. I'd say pick a bullet you want to shoot most, target the twist to that and take whatever other bullets you may be able to run as a bonus. In your case, I'd say a 9 or 10 would be safe for the 69gr. Bergers and still be able to run the shorter non-VLD's up near the 100's. JBM has a twist calculator that may ease your mind on picking a twist. You will need to know a few items like MV and bullet length to figure it out
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JBM Stability
JBM Stability