While it doesn't say much about guns, Hackley, Woodin, and Scranton's book "History of Modern U. S. Military Small Arms Ammunition, Volume I" provides a fairly thorough discussion of that .45 round. If you look around on the internet you may find a copy of the official report on the 1906 pistol trials. I know it exists as I have seen it. BTW, the Colt New Service was determined by the Army trial to be the better revolver, and the Army did later adopt it as the Model 1909 Colt New Service revolver, but chambered in .45 Colt (actually a cartridge very similar to the .45 Colt) for Philippine service. Both the 1909 Colt revolver and the .45 M1909 military cartridges intended for it are very seldom seen today. Hackley, et al, also discusses the M1909 .45 cartridge.