I generally use; Hunting (long live jumpshots and speedkills, If my team is capable of focus firing the Patriarch I even pull jumpshots on him when he's curled down), HSG-1 (lightweight, but very slow magazine reload), lever-action (trash clearing with this I never run out of my main shotgun ammo and keep Hunting for big fierces. Perhaps you can flinch &uppercut Scrakes with it too, which I never tried)
Then when I step out and have munnay, at late waves (9-10) I change to;
Hunting, Combat Shotgun, MK23/MAC10, Machete/Katana
Combat allow me to enrage 2 or 3 Fleshpounds on my stacked grenades in a blink, and I finish each of them by Hunting.
I never liked AA12, but I think it could be fun if you pair it with Vlad or Multichamber and go mobile with a kiting zerker+medic team.