This may be counterintuitive, but I would recommend the 10 guage Remington SP-10 Magnum. I have one and have found that it fires the most extreme magnum loads you can imagine (2 1/4 turkey loads in 3 1/2" magnum) but with no more recoil than many 12 guage 3" rounds I have fired. This can probably be attributed to the gun's considerable weight, 11 pounds.

Caldoc