I've got an RRA NM4 in the mail and have begun putting together some handloads in anticipation of its arrival. I've never loaded for a gas gun before but have heard good things about IMR 4895 and BLC 2-neither of which I have on hand. I do have, however, a lot of Benchmark that work wonderfully in my bolt action deuce. I burns clean, is amazingly consistent and not the least of which, meters well. I was just wondering what success (if any) people have had with it in an AR. TIA.

26gr Benchmark and 50gr Sierra BltzKings