Sharps-Borchardts were just too late to have an impact, I reckon, but they're surely a great design. I've had a couple over the years, but they just don't quite "fit" in my mad schemes. Only US military Winchester SS rifles I know of are the Low Wall Winder muskets in .22 short, but I haven't really been paying attention. Again, they were probably too late for US military consideration (1885), besides there simply was no real interest in upgrading to anything that came from outside the Armory system until that newfangled "smokeless" powder fad came along!