They made some .50-140’s too.Navy Arms used to chamber their rolling block replica in that caliber,among others.The empty brass were over 3 inches long,paper patched bullets were up to 700 grains.
Firing 20 rounds rapid fire should give you a work-out similar to a couple rounds with an MMA fighter.
Good grief!
Found a clip of someone shooting one:
C Sharps 50-140 cal rifle...first shots.
https://www.youtube.com/watch?v=o2e71aD5bFI