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I think what I didn't understand was how manufacturers produced ammunition in other names- like Remingtion 3030WIN or Federal 45ACP. Now that I understand the history, the rest makes lots of sense.
To the OP , there is a cartridge called the .45 Winchester (Win) Magnum (Mag), and it is both longer and loaded to higher pressures than the .45 ACP....
Another cartridge combo that'll mess with your mind is the .38 ACP/.38 Super....
Aw , I'm just trying to share the things I learned the hard way.......when I began to reload .38 Super , the connection to the .38 ACP was kinda weird to discover !...
Alls London, with ammo there really are no embarrassing or dumb question, better to ask a dumb question than to have dumb mistake that could cost you a gun or an eye.
There's been a couple of printable charts posted a few months. If you can't find them, pm me. I might still have them. Lots of the names/numbers will make wayyyyy more sense.
Clint