For the .556/223 ARs, mostly Winchester and lake city .556. I'm fairly well stocked up on both. I avoid the steel case stuff, I won't use steel case in mine only because I feel they will beat the hell out of my extractors, if for no other reason. On the AK, I use only steel, so as not to seem a steel case snob. AK's were built for it. AR's not so much. On the dedicated .22 AR's, I like the Agulla product line. I'm actually messing around with them a bit. I've wiped off the wax coating and replaced it with a blast of remi-dry lube. Gonna give it a whirl on the next outing. I know, the .22 guys love the wax build up in the lands and grooves but the upper I'm using has a moly-teflon coating on it. We'll see. For the 308 AR, I've keept it only on Remington core-locks. Expensive, sort of, not so much, whatever, but so is the rifle. I have battle packs, but only if needed. I hardly ever use it. Love it, actually my favorite, but it's the queen.