In David Munday wrote:

A 20th century example of the same sort of confusion was solved by
Stalin. He'd been invited to attend a demonstration firing of the new
120 mm artillery rocket, but when the soldiers opened the ammo case,
it contained 120 mm howitzer shells. Stalin then ordered that the
official designation of ammunition caliber be unique. Those rockets,
for instance, might be designated 121 mm despite their being 120 mm
across.

And of course a .357 and a .38 are the same diameter.

Unless the .38 is a .38-40

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Del Rawlins-
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