A 00 buck load of 12 ga is like getting hit a nine 9mm rounds all at the same time. I've heard it stated it's a submachine gun burst with every shot, but the reality is even worse than that if you are on the receiving end because it hits all at once. My preferred load is Winchester buffered #1 buck but it's about as hard to find as Federal flite control in #1. I'll take 16 almost .30 caliber rounds in each trigger pull.