I have a bolt action shotgun that has a full choke and should be good for singles (and at the local club where I've shot Skeet before, you can choose to have all your targets presented as singles only. No true pairs or even report pairs if that's how you want it.
My long-barreled shotgun is like a Marlin Goose Gun, but it's only got a full choke
30 inch barrel rather than a 36" barrel,
and it is chambered 2 3/4 only.