After having my interest picqued in a 1876 lever-action 45-75 Winchester, I did some research and I may have found a pretty fair bear stopper (not that's it been lost). Oliver Winchester's company did some pressure and strength testing to see how strong the action was, and worked up to a whopping 203grs of black powder pushing 1750grs lead bullets (5, 350 grs stacked) and the rifle held together was the 6 and 7 stacked bullets that made it come apart. So if I stay within the test perimeters, I'd say, "See what I can do for Brown!" Man, 203grs+5, 350's=1 busted shoulder...maybe better off getting a whooping from brown.