With double triggers YES
Definately not. I can't think of any offhand that can, but if it is not marked on the barrel then it cannot shoot them.
probably not, historicly shotguns are smoothbore if you shoot a slug, THAT would be rifled.
Shotguns fire shot shells. Handguns can fire specially made shotshells.
NO. 3 1/2 shells are fairly new and only to be shot through rifles rated for it. If it doesn't say it on the barrel, DON'T DO IT!
The sizes of shells it accepts will be stamped on the barrel
It will be marked on the barrel.
ALL rifles have barrels that contain "rifling". This is usually in the form of spiral grooves cut into the inside of the barrel- a few have a non-round barrel, with flat surfaces that twist as you go up the barrel. At one time, ALL shotguns had smooth bores- no rifling. However, SOME shotguns now have barrels with rifling, used to shoot slugs. They are still not rifles, as they are meant to shoot shotgun shells.
Yes, shorter shells are no problem.
Yes you can. Lead Shot is Lead Shot. I shoot all kinds of different sizes of shot out of my Mossberg and Remington Shotguns. What you do not want to do is shot a slug out of barrel made for shot. Get a rifled barrel for that.
yes it will. the rating shotguns are chambered for is the maximum size shell you can shoot. i have a 1100 LT chambered for 3 inch and i shoot 2 3/4 inch shells out of it mostly.
It depends on what you want to do. If you want to hunt, like duck, I would recommend a semi-auto shotgun chamberling at least 3 shells. If you want to shoot fast and accurately, like quail hunting or skeet shooting, I would recommend a single trigger "over and under" shotgun.(I think this is the best shotgun) But I would not recommend a double-barrel shotgun because of the barrel positions for any of these topics. If you just want to collect shotguns just get engraved and in good condition shotguns. (That's what I would recommend)
as long as there are no cracks in the barrel, yes. it simply means not to shoot slugs thru the barrel.