I've used single shot and pumps. They work fine.
While I got started with a semi... nowadays, I'd say a single or a double.
- Unless you're in a target rich environment, if the game you're shooting at isn't down after 1 (or two shots), a 3rd (for waterfowls) or 4th-5th (for same game) won't change anything.
- Unless you have a dog to retrieve your down bird (or you are flushing them in some sort of field where it will be easy to locate) shooting more than one at the time and trying to find them afterward is kind of time consuming
- A double will give you the option of two chokes
- They'll shoot anything from light bird loads to full loads for waterfowls.
Haven't gotten around to hunt turkey's... so can't speak about the specific of that...
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If his objective is to piss-off a lieberal, then sure, why not get a Benelli M4

... or a short barrel pump (with a bayonet mount while at it)
- They'll go fine for chasing grouse and hare in thick bushes... for wing shooting, well, I guess you'll need to get used to them.