Every Scope/mount on a heavy recoil rifle will eventually break. It may take 10 rounds or 20,000 rounds depending on quality of scope, mounts, degree of recoil, and resistance of shooter. I have had several scopes "break" on a 458win. The one on there now has lasted several years and several hundred shots. I would think that scoping anything more powerful than a 458win would cause headaches in more ways than one. That said, xausa seems to be getting away with it.