[potentialglock]

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?

 

[willfully armed]

Mm in length for metrics.

 

[Overkill0084]

Enjoy:
http://en.wikipedia.org/wiki/Caliber#Cartridge_naming_conventions

 

[c3shooter]

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.

 

[locutus]

The second number is the case length.