That's OK - I have one of those too. A model 1871/76 Mauser that was originally a .43 Mauser that I re-chambered to .450 Alaskan for black powder and mild smokeless loads 1,500fps with 500's - kicks like h**l in a 6 pound rifle.

Then there's the .458 Alaskan - my own version of the .450 Alaskan to fit and work in a bolt gun - 2,200fps with 500's - easy and low pressure - for a modern bolt gun, that is. Has 7gr. greater capacity than a .458 Win Mag. and only 2.1" long.