Well, I took my FN DMR II out last night (5.56) hog hunting as I gave my F-I-L my 6.8 to shoot. I was using 64gr Speer Gold Dots.
I got into a sounder on a friend's place.
Looking at the video I know I connected with five hogs...four of which took multiple hits. I may have overlooked and lost a downed one in the tall grass, but at least one took two solid hits and kept running off property. Only three were found, but again the grass was high. The final pig was a ~125lb boar that got separated, and came trotting towards me after I turned the recorder off. It took three hits to die...the third being an "I give up" head shot.
20-25% loss rate is what I experienced the first time I made a go at hog hunting with the .223, and this time out was no different. Follow up shots are indeed faster, but it's a bit disheartening to see them buck, spin, and take off again.
I got spoiled using a .308 this past month. 19 individual hogs shot...19 hogs recovered. With the 6.8 this year I've recovered 47 hogs while losing five that I know were hit (89% success rate).
I'm not bashing the .223. I stated earlier in this post that I believed it effective with good shot placement at reasonable ranges. However I wanted to throw in some real world data that I've collected.