I have noticed after 60 years of reading history, that when "history says", it really depends on whose writing thehistory. An example is Tom Horn. Many historians site calibers ranging in the 45-60 class, and various Winchesters. The truth of the matter is he when made his famous rustler cleanup, he was using a fairly new Model 94 Winchester rifle in 30WCF, know today as the 3030.
Scibaer is pretty much right when he said only Bob Ford knew, and he currently isn't available for interviews. Hell! Jesse James probably didn't even know, and he was there too.