I have a CZ 550 American Safari Magnum in .458 Winchester magnum which sports a Leupold M8 4X scope, about as simple and reliable as a scope gets. I don't shoot it a lot. Maybe 20 rounds when I take it out. Never fired a factory made cartridge out of it. Probably never will. I can handload a 500 grain bullet for a buck and a quarter a shot, a 350 grain bullet for maybe 80 cents. Factory ammo is several bux a shot.