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Sorry if this is annoying but I can't let this go. There are different gauges of shot guns. Think of it as the size of shell. A 12 gauge is bigger than a 20 which is bigger than a .410 gauge. There are different loads for shells. Buck shot consists of larger shot. Bird shot are smaller and there's way more shot in the shell. There are different chokes on the end of shotgun barrels. These can act as a funnel to keep the shot in a tighter pattern. An open choke is just a straight barrel. There are shotgun shells that only contain one projectile. Those are called slugs. Typically shotgun barrels are smoothe bore but there are some rifled ones used for deer hunting or other larger game.
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