I did a lot of hog hunting when I was stationed at Pensacola. I liked the Marlin Guide Gun in 450 Marlin. When it hit, the hog just went "flop" and started kicking. A very effective gun for hogs. The factory shells for the 450 are quite a bit stouter than factory 45-70 rounds but if you handload, there isn't any difference in the 2 rounds when it comes to ballistics.

For what it is worth, I've got a Marlin 45-70 as well but it is a full sized rig and not the shortened gun like the Guide Gun. So, the Guide Gun got the nod for hogs since often I needed to go in the thick nasty stuff and the shorter gun was easier to wield effectively. I used it on a few bison as well. It works for them too!