There is more to it than making the shells fit and fire. The steel shot of today is very high pressure and all magnum loads. Some of these guns are 75 plus years old and never built for that type of shooting. You will see busted wood and barrels off face if fed a steady diet of this stuff. Steel stot has a very "snappy" recoil which does not suit a SXS shotgun.There are plenty of guns out there to shoot this crap in and they will have replacable barrels. I shoot an 85 year old W.J.Jeffrey and and A.H.Fox,never will see that stuff in my tubes.