Your rifle was made in the black powder era with the corresponding metallurgy.
If it were mine, I'd shoot cast bullets exclusively (or almost) and stick with either black powder or equivalent pressure smokeless loads of powders such as 4759, AA5744, 4227, Trail Boss, etc.
This action is strong, but after 130 years, metal fatigues, and it wasn't designed for a steady diet of "patched" bullets.
