6 BR in 22-24 inch BBL-Velocity ???

[Hellbender]

Anyone have any experience with this round?

I'm thinking about building a new gun and I'm only interested in the 105-108 grain loads. Is 2800-2850 fps a realistic goal??

All the data I'm seeing is in 26-28 inch BBLs, I'm looking at a 22-24" gas gun build, and looking for some realistic estimates on velocity.

Thanks!

 

[Cheyenne19]

Re: 6 BR in 22-24 inch BBL-Velocity ???

I don't know about 22"-24" tubes. I'm running 105's 2950 in my 28" 6br.

 

[dmgreene]

Re: 6 BR in 22-24 inch BBL-Velocity ???

I don't know about gas gun firing pins and fit but to get the velocities that cheyenne is getting you usually have to have a small diameter firing pin and a bushed bolt or you will be piercing primers. I'm running 105 VLD's a touch over 2800 in 26" barrel. When I start getting around 2850 I start having problems with primers but I haven't had the firing pin bushed yet. I may send off to Gre-Tan later and have it done.

 

[Cheyenne19]

Re: 6 BR in 22-24 inch BBL-Velocity ???

I'm dumb and didn't even see the gas gun part. I have doubt about how well it will feed, but I could be wrong.

 

[Bronco]

Re: 6 BR in 22-24 inch BBL-Velocity ???

Yep, you can do it in small format AR using necked down 6.5 Grendal brass to 6mm. I'm getting 2820 (2750 is accuracy load) with 105 A-max and 2915 with the 87gr. V-max, using 22" barrel. You can find the specs in another thread on rifle forum about 6.5 Grendal.

 

[Hellbender]

Re: 6 BR in 22-24 inch BBL-Velocity ???

Are you guys running the Lapua brass with the small flash hole diameter? I think it's .059 instead of the .080 norm?

CCI 450's?

All supposed to help with the primer piercing.

Thanks.

 

[Bronco]

Re: 6 BR in 22-24 inch BBL-Velocity ???

Lapua brass, and wolf sr mag. primers. Primers haven't been a problem, pressure shows up as shiny ejector marks.