I own a D Max sidwinder and enjoy it very much. I wish I had more time to shoot it. I have shot the hotest loads available from Corbon with no ill effect. The cylinder is nearly 3 inches long to accomate the 410 3 inch shells. The gun is massaive and has little recoil with even hot 45 colt. I would not hesitate to shoot the hotest loads, Magnum reaserch also makes the BFR in 45 colt +P in a short cylinder. my 2 cents.