I've often wondered where the dividing line is between what is a semi auto rifle and what isn't. As far as I'm aware - and I'm happy to be corrected - an automatic keeps firing as long as the trigger is depressed and there is ammo available, a semi-auto fires every time the trigger is pulled and a single shot (bolt action etc) requires manual reloading between each shot.
Double rifles are able to discharge two rounds with repeated trigger pulls. Ok, some have twin triggers (and that may make a crucial difference in terms of the definition) but some do not, so I'm guessing that effectively we have a two shot semi-auto in a full bore calibre. Perhaps, as with the trigger issue, the fact that the rounds are discharged from different barrels may make a difference.....to the definition even if not the target.
Come on, put me out of my misery/confusion.