I load bulk .223 for a Bushy m4 carbine and a Rock River varmint. For the M4, I buy 55gr FMJ's for plinking. I have a lot of brass on hand so I don't have to worry about that. My last estimate was around $150 for bullets, primers, and powder. I load hornady 75 gr bthp's and 69 gr match kings for the rock river. That gets quite a bit more costly, but still a lot cheaper than buying factory anmmo.