The 50 AK functions at 35,000 psi with a 400 gr bullet at 2000 fps
The 45-70 with a 400 gr bullet at 2000 fps generates just under 45,000 psi
Both safe in a marlin 1895, recoil is identical for obvious reasons.
The choice is yours, don't exceed 45K in the marlin no matter the caliber and both you and the rifle will function for a lifetime .
Good Hunting
