I had 4 different 45-70 dating from 1976 up until a few years ago. They are over rated. I still have the Marlin 44 mag. There is nothing a 45-70 will do that a 44 mag won't do until you get into the "Nuclear" 45-70 loads. And by the time you get to those loads you need something better than 45-70. It's 375, 416, or 458 mag time.
I've seen it done with 243.
Even with the problems the Marlins would be my choice.
I've seen the two deer with one shot trick done twice with the 45-70.
I've seen it done with 243.
Even with the problems the Marlins would be my choice.