A 20 gauge shotgun loaded with buckshot will kick more than a 12-gauge unless you are using high-pressure hunting loads. Tactical, or self-defense, loads in the 12 gauge recoil a lot less than 20-gauge loads.Precision wrote:hadn't thought about a carbine or lever action.
BIL primary argument against the shotty is unwieldiness so he would have the same argument against a carbine / lever action. I think my sister is afraid of shotty recoil. I should probably take her shooting with a borrowed 20 ga so she can see it is half that of a 12 ga.
Regardless I think this is a good application for the pistol-caliber carbine. I particularilly like the M1 Carbine (with Remington soft point loads), though we can argue about whether it is a "pistol-caliber" or not.