My Great-Grandpa carried the "assault weapon" of his day when he was the neighboring county's sheriff in the early 1930s.
He carried a Winchester Model 1907 in .351 WSL.
Intermediate caliber, semi-automatic, detachable magazine.
He also carried a shotgun, but that was more so he could stop and shoot at birds as the mood struck him.
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."