We are still talking about two different things. This thread remains a discussion about what the 38 US Service Cartridge was. Check out the link to a video below, and you will learn that the .357" Colt cartridge started in 1892, not 1903. Colt in its infinite wisdom still made revolvers in larger bores, but the bullets fired were .357" with a hollow base. The US Military demanded this in 1892, effectively ending the use of heeled bullets in the Army and Navy. So confusion remained for years about what to shoot in these old guns. The reality was that both calibers could be shot Colts, but not S&Ws. Both calibers were made into the Twentieth Century, but standard ammunition for the Military was only made in .357", which was called US SERVICE Cartridge by S&W.
S&W introduced their Model 1899 and it was bored for the .357" bullet, capable of shooting both 38 Special and 38 US Service Cartridge. The Service Cartridge was only loaded in .357" and it is thought that the name 38 Long Colt started at that time while the old 38 Colt cartridge became the 38 Short Colt. I am sure that some 38 Colt heeled bullets were shot in the Model 1899, but pressures would have had to go up since the Colt bullet was .02" too large. It is not known when the heeled bullet ultimately went away, but Colt changed their bore in the very early 1900s, eliminating the need for a hollow-based bullet.
Of particular interest is a segment starting at 7:43 into the video.