458 SOCOM is doable in an 1895 Marlin without too much concern....
I talked with this fellow about doing the conversion:
Nonneman Custom Rifles - Fine quality firearms for the discriminating shooter
What you'll need to do is nothing more than this....shorten some Starline 50 Alaskan brass to about 1.6", run them through a 458 SOCOM die(I prefer CH4D or Hornady), final trim, and go.
That will solve the rebated rim concern.
For states that have cartridge length restrictions for deer, such as Indiana, this isn't a bad way to go.
When loaded past the 35k psi range that the AR bolt limits this round to, the little cartridge can be quite inspiring.
I've got one on a Mauser action with a 20" barrel, the last outing with it I was at 2050fps with 300gr. Hornady's without any pressure signs whatsoever, and case capacity to spare for my next range trip.