The way I remember mm to inches, in smaller sizes is my caliber, as in guns, a 9mm is a .38 caliber approximately 3/8 = .375; 7mm is approx. .30; 6mm is a little less than .25
The way I remember mm to inches, in smaller sizes is my caliber, as in guns, a 9mm is a .38 caliber approximately 3/8 = .375; 7mm is approx. .30; 6mm is a little less than .25
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