I have a small handful of the original .380 Revolver cartridges and they are nothing close to a .38S&W.
The .38S&W casing served as the platform for the .380Mark II revolver cartridge used in the Service in the SECOND World War. The commercial .38S&W is loaded with a 146-grain bullet, while the military loads are with a 200-grain or the later 178-grain. The casing of the S&W is noticeably fatter than the original .380 Revolver cartridge.
My .380 Revolver cartridges have a folded-head construction with a Boxer primer looking much like a small-sized shotgun primer, battery cup and all. They date from the very late 1860s and use a heel-type bullet with external lubrication. These are definitely "antique status". I have not tried to duplicate them because I have no .38 that old.
The .38S&W casing served as the platform for the .380Mark II revolver cartridge used in the Service in the SECOND World War. The commercial .38S&W is loaded with a 146-grain bullet, while the military loads are with a 200-grain or the later 178-grain. The casing of the S&W is noticeably fatter than the original .380 Revolver cartridge.
My .380 Revolver cartridges have a folded-head construction with a Boxer primer looking much like a small-sized shotgun primer, battery cup and all. They date from the very late 1860s and use a heel-type bullet with external lubrication. These are definitely "antique status". I have not tried to duplicate them because I have no .38 that old.