Spend a day each year patterning and sighting in a 12 gauge with a variety of three and a half inch magnum turkey loads and you will lose all fear of any rifle cartridge that isn't suitable to stop a Cape Buffalo charge. The most powerful rifle cartridge that I have personally fired is a 375 H&H magnum. It was a joy to shoot in comparison. I own a 30-06, 7mm mag and 45-70. I have never had any recoil induced problems with shooting any of them.