IMR 4064 works great so does RL-15, Varget forget it can't find it since last year, but I tried RL-17 so far nothing conclusive, last test load with 47 gr of RL-17 produced 1.2" - .82" 5 shot groups, so I'm back to 4064 and RL-15, did tried once H4895 couldn't get those fliers to stop...