Winchester Super X 223 Rem 64gr Power Point Rifle Ammo. In a KelTex SU16 Charlie, 16" barrel, 1:9 twist.
I'm a firm believer that bullet placement is far more important than caliber. That said, I chose the 64gr because it is on the heavy side and still shoots accurately from my gun. I spent a lot of time reading what various people say regarding use of 223 for hogs. Seems there are the "bigger is better" folks who think that 223 is puny for hogs and the "shot placement" folks who gave lots of examples of downed hogs with their 223. I have a friend who hunts coyotes year round and therefore shoots lots of hogs with his hand loads for .223 as well. He says he shoots at head/neck juncture. He hasn't had any problems with lethality. Me, I try to make my first shot count...then if there are multiple targets remaining I'll use the semiautomatic capability to follow retreating hogs.
this was my first hunting season with it. The hog I shot dropped immediately, shot just behind the ear, and kicked a couple of times, feebly. bullet did not exit, very large blood flow from mouth, obviously bullet tumbled/fragmented hitting spine and jugular.
Coyote shot thru heart dropped so fast that I didn't even see it fall, at about 100 yards, no twitch. Bullet exited far side, obviously tumbling.
I dropped two axis in their tracks, head/neck shots at 80 yards, one never moved, other twitched once. Damage to spine/jugular so massive I did not need to bleed either out. I have a scope on the rifle, variable to 9X.
My opinion, so far, is that it is as deadly as the 30-30, 264 magnum and 270 I have used for years, but the total visible destruction is less. I wouldn't shoot with it thru grass/weeds the way I would with a heavy 30-30 bullet because I know it will blow up when it hits a grass blade. A 270 would blow all the way thru an axis buck shot in heart/lung area. A 30-30 bullet stops just under the skin on the far side of an axis buck heart/lung shot (2 out of 3 times) . Haven't heart/lung shot an axis with it yet but believe that the above bullet would penetrate into heart/lung area and then tumble/fragment there causing massive damage stopping the animal just like my other calibers, all following a 30 to 50 yard run.
My net...the best gun is the one you have with you that can be brought to bear, accurately and quickly, on the target. I love my SU16 Charlie semiautomatic because it is extremely light and a 20 round magazine allows multiple follow up shots without loosing sight picture. The other guns are lever and bolt actions, weigh a lot more and multiple accurate shots on fast moving hogs are not really an option.
Hope this gives you my view of lethality of a .223. On a very large hog, I would still take a standing ear canal/neck shot and follow up if needed with multiple shots. I would take the shot out to 200 yards only if the target were never going to get closer. On the likes of a 700 lb hog, the head/neck area is so large that I believe I would continue to target that area if multiple shots were needed...while a body shot would likely lead to death, I doubt it would be within 50 yards.