Quote Originally Posted by belizejet View Post
OK, another question. I am thinking of finally pulling the trigger on a 6x45 barrel in 18" but dont know what twist. 1:9 or 1:10? I plan on trying standard size .243 projectiles like 85grn plus or minus. not any heaver than 95grn or I would lose any advantage you gain over the 300BLK. I bought the dies already to start making brass and now I want to build the upper.
Most of the bullets larger than 85 grains will shoot, but will not feed from a standard AR magazine. I have a C-products stainless mag that lets me get a few more thousands of overall length to shoot 87's.
I shoot mostly 85's in a 1:10 20" barrel AR. BTW the 60 grain HP's are outstanding in both velocity and accuracy. They seem to hit coyotes way harder than a 62 grain bullet from a 223.