Jim,
For all practical purposes a 1-1/4 load at 1,300 fps will general the same recoil in a 20 gauge as in a 12 gauge. To generate less recoil the 20 gauge will have to fire a lighter payload or the same payload at a lower velocity.
Firing the same load, the 5.8 lb Benelli will kick significantly harder than the 8 lb. Remington. The action type doesn�t matter.
I don�t notice any difference between gas and recoil operated shotguns of similar weight and fit. I think recoil guns get a bad rap as kickers because they are most often lighter.
