Re: Weapons sizes
Quick answer - No reason at all!
The gunsmith designed the gun with what ever caliber he desired!
Some are the result of "conversions" from inches to mm (ie 12.5 or 12.7mm = .50 inch)
Also it depends often on what is being measured - sometimes it is bullet diameter, case diameter, bore diameter (with or without including rifleing), etc.
Often if a particular caliber round is available in large quantities you will design your weapon to match, perpetuating the number.
Often different manufaturers will measure/describe different things to mean the same size - look at the .38 special, it fires same size ammo as a .357.
|