Why, hells bells ! My 1888-vintage Model 1873 will handle the Saint Bagwell load of 480-gr PH at just under 1300 fps.
But with the 32.5" barrel length on the standard USA issue it might be right at 1300 fps MV.
That rifle is in great shape, with ramrod bayonet, butt trap, and Buffington sight.
I'll have to start feeding her PH bullets and calling her "Buffy."