I still haven't gotten to the range with mine yet. I put a Vortex Copperhead on mine with 6 hole rings. The Copperhead is supposed to be built for magnum recoil so hopefully it handles the 458. Have a Bowers 50 suppressor that goes on the end. I've been around enough loud guns.
Shot a 50 Beo (one shot) with a muzzle break that made my ear ring for 6 months. Shot that same gun with a suppressor a year later and it was much nicer.
Effective range should be 200 yards, maybe 250. I bought my ammo from Custom Reloads of Dallas.
It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.
— Dwight D. Eisenhower