Also of possible interest: I recently was able to purchase a box of Hornady 250gr Monoflex in .458 cal. They are made specifically for the 1895 Marlins in .450 and .45-70. Hornady recommends MVs between 1400 to 2500 fps. But those are MVs expected from the Marlin rifles. Anyway, I've loaded a bunch for my #1 Ruger in .458 WM to simulate (if possible) a Marlin in .45-70.