Also you had the S&W M52A chambered for the 38 AMU cartridge, believe there were some special bullet mould designs for the 38 AMU cartridge too. The Colt M1911 converted to use the 38 Special cartridge had "slight grooves" in the chamber because of the unlocked barrel - do not know about the 38 AMU chamber in the Colt.

I still turn off the rims and cut an extractor groove in 38 Special brass so I can load it for my Winchester Model 1905 rifle chambered for the 35 WSL cartridge