Originally Posted by janice6
Neophyte conflicted between English and Metric.
If a .45 Cal. is big, a 9 mm (2 X .45 is not 9 but .9) must be a Mortar or mistake. Corrected to .9mm.
Thanks Janice, I learned something today. Googled "Caliber" and found:
"For example, a small bore rifle with a diameter of 0.22 inch is a .22 cal; however, the decimal point is generally dropped when spoken, making it "twenty-two caliber"
or a "two-two caliber". (Wikipedia, FWIW)
....but ".9 millimeter" would be about the diameter of a needle.