As always, lots of info from our knowledgeable members.
Quote:
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.38 revolvers transitioned to non-heeled bullets with a nominal bullet diameter identical to the INSIDE case diameter which was about .357
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Which doesn't begin to explain the .38-40 cartridge from the 1880's, since the bullet has a .40 caliber / 10mm diameter.
How the heck did that happen?
Bart Noir