I find H335 does an okay job for me. I have a non free floated Cav-15... so I cant produce any really nice groups. Its got a 5k round count on the barrel, I dont know if thats got any play into it or not...
Try some 748, my sierra manual says in the ticket, and a lot of guys have reccommended the powder to me as well.
AA2230 is also a good powder to try.
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