Originally Posted by
fourarmed
I'm getting some decent groups with the Lee TL bullet. I'm casting it of 20:1 and shooting it unsized. The load is 18 grains of IMR-4227 with a cci 350 primer. I went to the magnum primer because I was getting a lot of unburned powder in the barrel. It didn't really help. I'm guessing that the pressure is too low, but I really don't want it much higher in an old rifle that isn't mine anyway.
I'm thinking of several options: rifle primer, harder alloy, faster powder. Any ideas?