I was using the Remington (re-branded Barnes, I think) .50 cal bullets and--despite their accuracy--I couldn't load one after the 7th or 8th round in my Genesis thumbhole muzzleloader even swabbing between rounds. I am using the Goex black powder EZ loads (100 grains). The I switched to the 250 grain Powerbelt Aerotips as well, and I can shoot 15 of those in a row without swabbing between shots once! I'm getting 2" groups at 100 yards with the Leupold UltimateSlam scope on top. Can't wait for ML or general gun season now!