I have had great success with H4895 in the M1A and the AR-10. The Hodgdon web site has lots of data. It is one of their 'extreme' powders, too. The load I am shooting in the AR-10 now is 39.7 grains of H4895 and the 165 grain Nosler BT hunting bullet, for 2530 fps(20" bbl). That is about 90% of the maximum charge according to Hodgdon.
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