A semi-auto in 45-70 or higher-power BP cartridge (not a fancy modern rimless SOCOM or whatever)
A pump-rifle in 45-70, specifically (I couldn't believe there hasn't been one...)
"I don't believe that the men of the distant past were any wiser than we are today. But it does seem that their science and technology were able to accomplish much grander things."
-- Alex Rosewater