Erik,
I don't have an AR10 platform rifle, but I do shoot thousand yard matches with an M1A and my bolt guns, and I am working on a thousand yard 223 round. I shoot the NRA long range bullseye matches. I typically shoot 1.5 minute of angle groups (15") with these rifles (308, 30-06, & 7mm Rem Mag). At Camp Perry I have seen a number of military shooters using the Mk 110 (an AR10) at a thousand, so it is capable. You do need to insure that you have enough barrel to keep the bullet more than marginally supersonic at a thousand in order to get good groups.
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Judge control not gun control!
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