packerbacker,
I found some new magic last week you need to try if you get a chance. The Core 15's come with a 1/7 chrome lined bore on most models. They will shoot most loads fine and as expected like the heavy stuff a little better. I was well pleased to see them under MOA with the federal 69 grain match (Sierra BTHP match). One of my friends wanted me to set one up with a scope and riser for his son to deer hunt with. I think the .223 is too light but was not my call. To get good penetration I ordered some of the Barnes Vortex 55 grain TSX ammo to try in it. Went 55 instead of heavier to insure expansion from the 16 inch barrel. Incredible accuracy. Literally under .5 MOA load from a stock rifle. Consistently got 1" or just under at 200 yards with just a 3X9X50 Zeiss Conquest mounted on it. Couldn't believe the accuracy for a milspec AR. Tried it with another Core 1/7 and got near the same results. Not saying the Core's are anything special but the combo worked. If you ever have a need for penetration in an AR hunting load I would sure give Vortex 55 gr. TSX a try.