I know a lot of you guys rave about blackhills blue box and how well they shoot and I have always shot them with great results through my bolt actions, but I have been having a lot of problems with them misfeeding or hanging up through my ARs. I've tried them in my Bush Varmiter, Bush Pred, and Armalite and the same result. I shoot one full clip fine and them a hang-up in the next clip. Switch to Win White Box, UltraMax, or Rem and no problems. I wish I had better results with them because of the price. But they don't seem as reliable as other ammo. I have shot over 300 rds of Blackhills and have had nothing but hang-ups with it with 3 different ARs, so it is not the gun or clip it is the ammo. I don't mean to pee on anyones wheaties here, just telling my side of the story with this type of ammo. Again I wish my 3 different ARs shot it well due to the $.