Just came across this thread & am interested. Have been collecting, shooting & instructing since my draft into the Army in 1965. Probably have shot most calibers from .17 thru 106mm recoilless rifle, as well as the old Davy Crockett tactical 80# nuke [simulator of course]. Used to participate with the FCSA with .50BMG, 1000m shoots, but shoulder & eyesight no longer allows. Right now into personal defense weapons - hand cannons especially. Have been an earlier FFL holder until slick Willie made it uneconomical from a business standpoint. My collection makes most armories jealous!