I have shot feral pigs with .223s, 22-250s, 220 Swifts, 7-08s, 7mm Rem Mags AND if you want SPECTACULAR kills, .300 R.U.M.! To be very honest, the .223s (ALL 22 centerfires) should only be used with TXS pills and the like. Then you really need "close-up", as in 150 or less, HEAD shots to immediately and consistently put them down. The 7-08s on up kill cleanly. But the "crazy" spectacular kills were taken by my .300 R.U.M.! It is amazing what this thing will do. I will share a "real" story. My rifle is a custom job with a 26" 1-10 Pac-Nor barrel. The excellent 200 grain Accubond is powered by 96grs of Retumbo at 3200f.p.s. I was on a hunt and the land owner wanted the "pig / pests" cleared out! One of the bigger ones, about 275-300 pounds was out at 326 (Bushnell Yardage Pro rangefinder) and broadside, feeding. I put the crosshairs about 2" high from dead center shoulder and touched her off. FLOP! We went up to get the old boar and what we saw was unreal! Bone, hide, meat and "internals" strewn all over! Hunks of meat about 6" long>>20 or so feet away! When we turned him over, he had a hole out the side so large that BOTH sets of lungs were hanging out the "gaping hole"! I never witnessed anything like that! Unreal!