PRS Talk 6 CM build, not sure about barrel length?

[FN-Whitney]

I am considering building a 6 CM for PRS comp's next year. What barrel length and twist do you find to be the best for the 6 CM? I plan on starting off with Federal Gold Berger 105's, if they work well, and then moving into reloading later.

 

[Hollywood 6mm]

I've been really happy with a 26" barrel. Moderate charges will get you into the 3060-3120 velocity range without taking a nasty hit to barrel life, and it's still maneuverable enough for barricade-heavy matches.

 

[lts1ow]

I had a 26in and now run a 28in on my 6 creed.

1:7 twist, shooting 110gr SMKs

 

[Missourimule]

I run a 26” Sendaro contour with 419 hellfire brake 1:8 gettin 3150 FPS with 105 hybrid target Berger

 

[dgheriani]

I run a few 26" barrels in 6 Creed, mostly M40s and 1 Heavy Palma contour most with 1:7.5tw (1x 1:8tw). Pushing 110s at everything from 2940-3150. Running the slower loads now for less recoil/easier to spot trace.

 

[Lilja Riflebarrels]

Like other's said, 26" is going to be just fine. The velocity gain won't be enough to justify going to a 28" barrel. Longer barrel = more whip.

If you aren't going to shoot 115 grain bullets, 1:8 twist will stabilize everything else just fine.

 

[Awesymoto]

not to hijack too much but I run a .243 and am about to move to heavy bullets 105-108 bergers. Since these two are very close i'm wondering 1:7 vs 1:8 as well... plan on using a 24" barrel.

 

[FN-Whitney]

I contacted Federal and they told me they test with a 1:7.5 with both the 105 Berger and the 107 Sierra bullets.

 

[Rob01]

26-28" and I would use a 7.5-7.7 twist. 8 would work with 105s also but no reason to not have a little more.

 

[Rob01]

not to hijack too much but I run a .243 and am about to move to heavy bullets 105-108 bergers. Since these two are very close i'm wondering 1:7 vs 1:8 as well... plan on using a 24" barrel.

Split the difference. 7.5. I wouldn't go full 7 unless you plan to use a bullet that would need it and the ones you mention won't.

 

[lte82]

Split the difference. 7.5. I wouldn't go full 7 unless you plan to use a bullet that would need it and the ones you mention won't.

Many 105 hybrids were run over the Applied ballistics doppler this weekend at Altus. Running a 7 twist at 2940 fps I wound up with a .286 G7, that was 100% confirmed down range. The 8 twists I saw were right at .274 and a couple 7.5's both had around 278-279. With a 6x47 7 twist my BC trued to around .288.

 

[FN-Whitney]

Thank you everyone for your input. I ended up going with a Bighorn Origin with a Hawk Hill Heavy Varmint barrel, 26" 1:7.5 twist. I plan on trying out the Berger 105's first and see how it goes from there.

 

[ThisGuy]

Thank you everyone for your input. I ended up going with a Bighorn Origin with a Hawk Hill Heavy Varmint barrel, 26" 1:7.5 twist. I plan on trying out the Berger 105's first and see how it goes from there.

If you don't like the 105, check the 107smk out. Out of my 7.5tw, I could not shoot a bad group. Very easy to load up. I am almost regretting changing to a 7tw to run the 115DTAC or 110SMK.

 

[FN-Whitney]

If you don't like the 105, check the 107smk out. Out of my 7.5tw, I could not shoot a bad group. Very easy to load up. I am almost regretting changing to a 7tw to run the 115DTAC or 110SMK.

I was looking at the 107SMK's, I have had great success with Berger bullets in the past that way I was starting there first but the 107's would definitely be my next move.