I own several .44 mags from a 4.6" Super Blackhawk and to a S&W PC model 629-4. Also have owned a .454 Super Redhawk in the past. They do not compare to the .460. And is you think champer pressure is irrelevant then you obviously never shot one. Heavy bullets loaded to the max make for a shock wave that will definately get your attention.
Pressure doesn't destroy scopes, recoil does. Sorry but a 7lb .460 is simply not going to punish a scope like a 40oz .454. Perhaps you're confusing muzzle blast with recoil???