45-70 works incredibly well with paper patch and smokeless powder. How about 300gr. bullets cast from nearly pure lead at 2000 fps, no leading, and 3 inch groups at 200M? Besides, you can even get the right size dies with no effort. Size bullets to .452 in a Lee push through sizer, patch with 10# drafting vellum, size with .459 push through sizer, load and shoot. No gas checks needed, no bullet lube, and as soft an alloy as you feel like. I'm a convert!