Back in my big-bore days, I had a Verney Carron double in 577NE, another one in 600 NE, and a custom AHR in their 700 AHR, usind a 1,250gr bullet at about 1,850 fps. It does take some technique to handle them. I would grip the rifle firmly, pull tightly to the shoulder so it couldn't get a running start at you, then put your weight on your front foot. When the rifle discharges, let it roll you back onto your rear foot, letting the weight of your body absorb the recoil. The real negative about such rifles is that they're too heavy to track Elephant of Buffalo all day. A good old 458 Win is all your really need.