Originally Posted by
CrowCommand
Im pretty green to loading for an AR but I've had good luck with IMR 3031. 22.4 grains grouped nicely under a 55gr FMJ at 50 yards in my Mk12. I was trying to develop a blaster/training load (not super focused on accuracy, but cheap and consistent) so I could throw it on the Dillon and crank a bunch out. I've put that on hold now, I can't find any more 3031, and I was caught with my pants down rifle primer wise. I normally just load pistol in bulk. I'm going to focus on precision 77gr loads for the Mk12 now.
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