Finally going to try my hand at reloading 308 subsonic. I picked up some subsonic Atomic 175gr as my factory test load to compare to. With online loading data, I've decided to try trailboss. I've made up 9.5, 10.0, 10.5 and 11.0gr loads using 168gr SMKs, 2x fired FC cases and federal magnum primers. I read about the 220s not stabilizing well in 308s so I didn't go there. If all goes well I'll test them tomorrow over the chrono and look for keyholes before pushing them through the can and optimizing for accuracy.