I've been shooting a Lyman 311291 sized at .309" in a Lee push through sizer and getting pretty good results as long as the velocity is under 1600 fps (even with a gas check). I've tried them air cooled and water quenched and the air cooled shoot a little better. It seems like 15.0 gr of 2400 did well using neck sized brass and a Win LR primer 2.55" OAL.