mpow66m Posted December 23, 2016 Share Posted December 23, 2016 5 hours ago, Lt DeFault said: "Calibers" are simply fractions of an inch. So, if you want to convert from mm to caliber, multiply the mm by 0.04. (Actually, 0.03937007874... but no need to get that precise.) Shotgun gauges are where things get weird. A "gauge" is determined by how many lead balls of the diameter of the barrel will add up to one pound. So, if you divide a pound of lead into twelve equal balls, the diameter of each ball will be 12ga. The only exception being .410, which is the caliber of the barrel. Yes.try your calculatios on a punt gun,lol 0 Quote Link to comment Share on other sites More sharing options...
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