475Guy- I tried Rl-7 and pressures were too high. The best powders appear to be ww748 and H335. all in the 52-55gr range. Basically this cartridge needs more powder capacity. I would absolutely not use these loads in a lever gun, even a modern 1895 win in .405! The Encore is extremely strong and can take 65Kpsi cartridges with the same rim diameter as the .405 win, so I'm comfortable pushing it. -Rob