For your M1 the range is usually around IMR3031 to no slower than 4320, Varget, R15 range. The problem with slower powders is the pressure curve peaks at the wrong time for the op rod, and bent or busted rods start to appear. Its not common but its a good idea to stick with medium burn rate powders. I talked with Federal once about this. Their 168 gr Match load which seems like a good load for an M1 is not, they said so. I pulled the bullets on a couple of them. The rounds I pulled down had over 54 grs of a weird looking non canister powder that according to their specs was running at 2700 fps. So doing a little book looking, it appeared that good old 4350 with 54 grs produced about 2700 fps, so the powder they are using is a close relative to 4350 which is a tad slow for the M1 gas system.