This is my first post on this board. I hope I am not too far off topic. I recently bought a NOS H&R 45-70 Buffalo classic. It came with a few boxes of 45-70 reloads, all marked with powder type and grains used. I do plan to shoot mostly BP, but am trying to decide whether to break down these loads. They use 3031IMR, 4198 IMR and RL-7 powders. Where can I get spec. and application sheets for these? Is the H&R capable of using moderate loads of Smokeless, using these powders? In addition while I do prefer and plan to use Cast Boolits, these are copper jacket with open lead front ends. Are copper jackets OK to use in the H&R? Any advice and help much appreciated. I have more questions about BP loads and wads, will post later. Thanks, Art