Referring here again to the .38 S&W, I have an old box still containing about 30 cartridges, all but one marked "REM-UMC", ".38 S&W". The box is of a granite or stone print paper with a top that lifts off, unlike today's styles with a slide out tray. The box is also marked .38 S. & W. SMOKELESS, 50 Central Fire Cartridges, and it's from the Remington Arms-Union Metallic Cartridge Co., Union Metallic Cartridge Works, Bridgeport, Conn., USA.
On the side is a label that says "Specially adapted to .38 Smith & Wesson." On the bottom it says shells should not be reloaded, so I haven't. By the way, the primers are marked with "U".
Mixed in the box are a few .22 rimfire cartridges, one of which certainly looks like copper, although the others (all marked with a diamond on the base) look the same as the old brass of the .38s, most of which look pretty fair, considering. I wonder if those .38 S&Ws mentioned earlier were actually copper.
Also mixed in with the .38 S&Ws were two cartridges marked ".38 Long," which is the first I've seen of this cartridge. They are about 1/4 inch longer than the .38 S&W and about 1/8 inch (these are eyeball measurements) shorter than a .38 Special.
Curiouser and curiouser.