I load a Speer 158 gr. LSWC with 3.3 gr. of Bullseye. Very soft shooting target load that I use for competition. Chrono's at an average of 652 fps, with a standard deviation of 21 fps out of my 6" Smith Model 10.
Hmmm... now that I read the title of the post again, it might not be what I'd call a "mid-range" load... but it's accurate.