Jack, if you value the opinion of an uneducated friend, I'll give you mine! My thought is that the government had a whole shitload of B.P. .45 Colt ammunition in warehouses, and that smokeless pistol powder was still a pretty new deal in 1898. I think the .45 Colt sidearms were makin smoke right along with the B.P. Springfield rifles. (and giving away your position!)