Sierra .224, 65 Grain GameKings
They're more accurate than 64 grain Gold Dots or 62 grain Fusions (in a friend's 24" PSA Varmint .223 rifle, there's no discernable difference in 16" Bushmasters or AK's w/1x Red Dots) and seem to kill pigs a little quicker with chest shots, although they don't penetrate as far, particularly if bone is hit.
My only real gripe with them is the amount of lead they leave on the feed ramps of an AR or AK.
The leading has never caused any actual malfunctions, it's just a pain to clean off with a brass brush, especially in an AR/M4.
I used to use RL15, but switched to TAC, partly because of how well it meters, but mainly because Western Powders published full 5.56mm level, pressure tested load data featuring TAC and 65 grain GameKings.
Unless I hunt power line R.O.W.s or across hay meadows (I don't use a 5.56mm there), I seldom get a shot much past @ 75 yards on pigs in this area. I've never shot the TAC loads with anything but irons, Aimpoints, or an Eotech so all I can say is that they're "minute of pig" accuracy wise.
Ramshot 5.56mm pressure load data.
http://www.hofmantopsport.nl/RAMSHOT Herlaadgegevens 04-10-2013.pdf
My RL15/65 gr. GK loads were worked up in a friend's (very accurate), scoped rifle and would shoot @ .5", 5 shot groups at 100 yards.
I don't think GameKings are as accurate as MatchKings (particularly the 52 gr. HP's), but they're sure as heck accurate enough for any sort of light/medium game hunting that'd be sensible to attempt with a .223/5.56 rifle.