Using corn meal method fire forming standard 22-250 to Ackley Improved . One poster said results he has ever seen was a partially blow out case. I figured got to be a better way. So I first loaded 6grs of unique with CCI Mag primer stuffed with tissue paper and corn meal and topped of with wax. But how loud is it? Low and behold I have a rolled up carpet. So I lay that out on back porch check for neighbors stick BBL in carpet pull the trigger " Bang" "Hey that was nothing" check case and its partially blown," Oh dang" Well one more try this time 10 grs of unique all the rest the same stick BBL in carbet a BAAAANNNNGGGG !!!!! But carpet muffles the sound I bet by 85% . Nobody noticed a thing and the cartridge case formed perfectly. However the carpet was smoking a bunch.