some of them are using around 100 gr of retumbo and the rest are using upper 90's of rl-25. one is at 97 gr's of rl-25 and mine is a little more. I know depending on the reamer it can very some so be careful. Most are using smk's they seem to hold up and fly a little better than the bergers. Primers are either fed 215's or remington 9 1/2's, Lapua brass. My buddy's gun was done on the same reamer, at the same time by the same smith and it will not take as much powder as mine.