I've run them on a couple of Marlin 1895G's in 45-70 and a Marlin 1895M in .450, using some hot ammo. Never had a problem, but I did wreck an old 2.5X M8 Leupold on a 1895G, while shooting the now defunct PMC +P 45-70 factory stuff. The recoil gutted the scope, and I was left with a tube full of stuff that rattled around. Leupold took care of it, and replaced the scope, no questions asked. Those VX-I 1-4X20 scopes are pretty tough, based on my experience.
