.44 mags and .454 Casull's may be hard on a scope but the true test is this beast. .460 mag and my pet load is a 300gn XTP with 44grains of Lil'Gun. Pushes it a little over 2000fps and about 2900lbs of energy.
Like I said earlier, the Nikons don't hold up and their lifetime warrany isn't worth the headaches after breaking two of them. The second one they sent me only lasted about 10 shots. The Burris is darn near indestructable.