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Thread: 6.8 spc twist rate?

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    6.8 spc twist rate?

    First let me compliment everyone on a great forum. I'm new here be but ya'll seem to be the most knowledgable people I've seen about buliding AR's. I plan to build a 6.8 spc on a RRA frame. I have an RRA ATH carbine now that I really like alot. I plan on building the 6.8 the same. I want to use it for hunting and target shooting. My question is what barrel and twist rate would ya'll recommend? I've seen 1/'10 to 1/11 and 1/12. I want to build it with an 18" match spec II chamber. I plan on reloading some 110gr Accubonds for it. Thanks ahead of time for all the help! http://www.rockriverarms.com/index.c...ategory_id=526
    Last edited by Denny2277; 12-27-11 at 22:16.

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    1 in 11, 4 groove. Allows for high pressure loads like SSA combat (tactical) loads with no problems

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    This helped me out a ton when looking into 6.8. Has a lot more info in case you needed to know anything else.

    http://www.weaponevolution.com/forum...6.8-SPC-Guide.

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    Quote Originally Posted by avmech View Post
    1 in 11, 4 groove. Allows for high pressure loads like SSA combat (tactical) loads with no problems
    Which manufacturers sell that configuration?

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    Quote Originally Posted by NavArch View Post
    Which manufacturers sell that configuration?
    It's in the link I posted but here's a link to the barrel chart.
    There's better twist and barrel groove specs than those but they only provide marginal gains in performance.
    Just depends on what you want to get out of it and what you're looking to spend.

    Bison Armory is probably the best bet as far as 1:11 and four groove.
    They're also decently priced in comparison to the others and you can get them bead blasted or gunkoted.


    http://https://spreadsheets.google.com/pub?key=tOtyqlb35yLitvWlWWajZyg&output=html
    Last edited by nanners83; 12-28-11 at 10:10.

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    Thanks for the research

    The table you developed implies a ton of research work.

    Now, at the risk of appearing to be rude, I need to ask a question. Why should my next AR be a 6.8 SPC? I don't hunt. The carbine would be for SD, which implies a serious level of practice, and cheap ammo options just aren't out there. Reloading every shot I take can get a bit old. This is a serious, neutral question. Inputs are requested.

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    Quote Originally Posted by NavArch View Post
    The table you developed implies a ton of research work.

    Now, at the risk of appearing to be rude, I need to ask a question. Why should my next AR be a 6.8 SPC? I don't hunt. The carbine would be for SD, which implies a serious level of practice, and cheap ammo options just aren't out there. Reloading every shot I take can get a bit old. This is a serious, neutral question. Inputs are requested.
    You probably shouldn't. I run a 5.56 for training and self defense and a 6.8 for hunting. Given the right ammo the 5.56 will do just fine in a fight.

    The 6.8 does offer considerably better terminal petformane especially when barriers are involved. But terminal performance is meaningless if you cannot hit your target, that is where training (and lots of ammo) comes in. I guess the other option is to setup two identical rifles (one 5.56 and one 6.8) and train with the 5.56 and save the 6.8 for serious use.

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