I took the most horrendous Intro to Statistics class last semester.
Before I figured out how to print out books in PDF format, I would simply look at my then digital watch and make calibr designations out of the numerals.
556, 545, etc.
NRA Life Member
Me: "The .45 GAP was an answer to the question nobody asked."
Trooper pal: "Says the guy who thinks .38 Super and 10mm are viable pistol calibers and gets mad when Wal-Mart doesn't have them."