I load my own. Not really excited about subsonic .223, but the .308 is pretty cool! I'm using trailboss powder and 180gr round noses wors great. I've got a 210 gr .30 cal mould but haven't had much time to play with it and the subsonic loads. Only tried it through my bolt action, but it's fairly accurate and very quiet.
Have another subsonic project in the works. Hope to shoot it some this weekend....