ok, that makes sense. When the rifle is out of jail, I'll test some 175s and some 180s with the port wide open and see what happens.
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Go to Hodgdon Reloading charts online. 300 Blkout. 125 gr hornady, 21.0 gr lilgun. 2409fps. Shoots wonderful in my Ruger Ranch. Wallacem in Ga
I wonder if using CFE Black would solve this problem. I think it was designed to produce more gas wasn't it?Probably will not cycle an AR at sub sonic loads