What a coincidence......5.2 grains of Unique has been my pet load for 40 years. I have used several cast SWC bullets with it from 150 to 170 grains. My two favorites being the Lyman 358156 155 gr. SWC with gas check and Lyman 358432 160 grain WC plain base (NOE now makes this design).
The 160 grain wadcutter is very accurate in my Ruger Blackhawk 357 magnum.

Gary