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What's the second number in the cartridge designation. Like 9x19 or 7.62x39 etc. Is the second number the bullet length or cartridge length?
 

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Bear in mind that the diameter is the NOMINAL diameter. A .22 Magnum is NOT the same diameter as a 22 LR. The 9mm Parabellum and 9mm Makarov or NOT same diameter. Sometimes the name itself is a bit screwy- .38 Specials are NOT .38 inches in diamter, etc.
 

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The second number is the case length.
 
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