I shoot most of my hogs with a .223 using
game bullets (not varmint). I have had no problems downing hogs with it, either shooting them in the ear or slightly behind, or sometimes in the heart or lungs. I prefer the ear shot if possible because there is no tracking involved. I have taken several hogs with it this year, and I took over 75 with it last year. Most of my shots are very close, probably half are 10 yards or closer, but I have also taken some nice hogs at ranges out to 200 yards with it.
If a person can't kill a hog witha 6.5 or 30/30, they need to put in some more time at the range practicing.