I think that 16" is actually the caliber, since “caliber” is “the diameter of a bore of a gun”. A “50 caliber gun” is a gun with a barrel length of 50 times the caliber. So a “16-inch, 50-caliber gun” would be a gun with a bore (caliber) of 16 inches and a length of 50 times the caliber, or 66 2/3 feet.
I know this Doc. I’m an engineer and pretty handy with firearms for a gal. My question was argumentative. And my .44 Magnum does not knock me down and stomp me…
Thanks, UB. I thought it was an agency from the usage, but had never heard of it. Though it would not suprise me to have multiple gov’t angencies with the same purpose.