Thanks for the input lads. The first five rounds that I shot out of the rifle were some 200 gr. bullets in front of Winchester 231 powder, and there was no gas blow-by. I have no problems shooting guns with recoil. Before I bought the rifle, I loaded only for my Uberti 1875 Outlaw that I purchased new in 1975. My favourite load was 30 grains of 3Fg BP and a 250 grain slug. That bullet will not load or cycle in the rifle unless I seat it ridiculously low. Perhaps all I need to do is go back to that load, but with a RNFP bullet in 250 grain. It might sound strange to you, but I honestly don't care a lot about where I place against my fellows - I just want to shoot realistic loads and have fun. "Spirit of the game" . I thought Trail Boss would be a good choice, but perhaps not.