I have tried: IMR4895, IMR4320 and Win 748 in mine under 200 Rem PSPCL and 225 partitions. I dont have access to my notes, but I do remember that I am currently using the 748 for the 200's and 4895 for the partitions. Velocity for the 200's around 2550 and is very shootable, no pressure signs. The 225's @ 2450fps, this is a hot load with some pressure signs, but is like lightning on game, I think it picks them off their feet!