I was reading a bit about the early Colt 1909s and New Service revolvers, and apparently their cylinders originally were bored straight through with no throat. From what I read, eventually for some of the 1917s, Colt added a throat to let the .45 ACP rounds headspace without a moon clip. Did Colt ever incorporate the stepped throat into the .45 Colt New Service revolvers? I'm interested in buying one, but I would have to imagine that having a throat in the cylinder would do wonders for both accuracy and leading compared to a cylinder bored straight thru.