I have shot several deer and a few pigs with a 44 Mag rifle and several deer with a 45/70, a Ruger No1. My brother and brother in law have shot several deer and pigs with Marlin 45/70's.

I prefer the 45/70 over the 444 Marlin for several reasons. Mainly because ammo is easier to find, and the Marlins 1 in 38 twist can be some what finiky as to what bullets it likes.

If you do not reload I can say that the 300gr factory 45/70 gr ammo kills deer and pigs like the Hammer of Thor, and has mild recoil.
Reloads with one of the 300gr bullets at @1800 fps will do the same.
With IMR 3031 start with 52gr, up to 56gr.

I have used reloads with 300gr, 350gr, and 400gr bullets on deer.

My favorite all round 45/70 load is the Hornady 350gr Round Nose [they make a 350gr Flat nosed bullet now as well] over IMR 3031.
Some where from 52 to 54 grains is usually very accurate in a Ruger or the Marlin at a velocity of 1700 to 1800.