Trying to squeeze a .357" bullet through a hundred-year-old .352" bore sounds like a good way to ruin a nice rifle. I'm not going to try it with mine!These are a lot more tolerant than most people believe. They can be shot with 357 or 38+P. Turn the rims to the diameter of the 351 and they will function just fine thtu the magazine. I believe it is 404. Do not use reloads with WC brass. The cases are weak. Plus P and magnum brass is good.