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hmmm I did not know that...
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Yep...it dosent stop there either.
American designations show no rhyme or reason.
For instance, the mighty .44 Magnum actually uses a .429 dia. bullet.
Most .32 calibers are actually closer to .31 caliber. The .45 acp normally uses bullets that are .451, yet the .45 Colt uses bullets that are .454.
9MM bullets are .355, but can be used in .38 or .357. I've actually done that and they shot very well.
The 7.62 x 39 mm rifle uses bullets that are .312, yet the 7.62 x51 uses .308.
but both are considered .30 cals.
The .444 Marlin uses .44 magnum bullets which are 429. When most guns are shooting cast lead bullets, they are usaully sized bigger such as .430 for the .44 or .452 for the .45ACP.
and there are a multitude of examples...
One of the reasons why is important to understand exactly what you are reloading.