The 45 Colt was a not chambered in the rifles due to the small rim diameter and the cartridge was known for not chambering easily in a black powder fouled chamber.
Straight wall cases don’t seal gas blow by in chambers like the bottleneck case does. The reason the Army used a trapdoor springfield was because of it’s superiority to handgun cartridge rifles in range and energy. Sodbusters liked the repeaters, the Army liked power. The 45 Colt also was more powerful than the 44-40.
