[mouser]

Henry arms makes a 22 smooth bore lever action gun
https://www.henryusa.com/shotgun/garden-gun-smoothbore-22/

[DOC44]

I used to do pigeon control when in college. Used a smooth bore 22 and it was impressive. Take em down in flight 50 to 60 ft. Great little shotgun ……..if you can handle the recoil. lol

[misanthrope]

Henry claims in their ad for their garden rifle that .22 shot damages the rifling in a barrel over time.

Having a hard time picturing that, not sure I believe it.

I can see how shot could leave sheared off lead deposits at the leading edge of the rifling, and that this deposit would be best removed before sending a slug down the barrel, but direct damage to rifling....ehhhh,,,,,I dunno.