davefl4200,
I agree with Graybeard on the recoil. If you're going to shoot the big ammo you're going to get kicked.
Yes, gas operated semi-autos will reduce the recoil....compared to a pump or double barrel. The heavier weight of a shotgun will help to off-set the felt recoil too.
I'm going to purchase a MP-153 in March. I can't wait to get started shooting this shotgun. I've heard so much good about it. Also, the MP-153 weight is at the 8 lb. mark.
Good hunting, Bowhunter57