My 2 cents worth.
I now have a Browning BLR, 450 Marlin having traded off the Marlin 45/70 for it. Same downrange results except I prefer a clip to the tube magazine.
The Speer 350's work as well as anything I have tried.
Scout scoped the recoil is sufferable and is decently accurate
It is my truck and saddle rifle, sure beats most anything I have tried. The Marlin has such a thick forearm, to thick for a under my leg saddle scabbard, butt back & off side. Bugged me.
The 45/70 is an interesting chambering, tons of history and good for campfire chatter. Every serious shooter should give it a go. Good luck