The barrel and chokes are not designed for steel shot, Runner. You might get away for a few shots, using the heavy plastic shot wads that Ballistics Products sell, with Steel, Bismuth, or Heavy Shot, but I would not recommend anything like a steady diet, and you will still need to call them in close to kill them. BP is not going to give you those fast velocities with heavy loads like you can get with smokeless. The gun was not built to take the kind of dram loads you would need to even get close. I would be more worried about the stock developing a crack than the barrel bursting, but it still would not be good for the gun. Buy a shotgun designed to shoot steel shot, and have that piece of mind. Then work up your loads.