As biggfish mentioned, the Hornady SST 250gr works really well out of the Wolf. We have used the 250gr SST, 100gr White Hots, and CCI Magnum primers to get decent groupings at 100 yards. Because of the short barrel on the Wolf, I would be happy with under a 2" grouping with pellets.
If you still aren't happy with the accuracy then, I would definitely recommend switching to loose powder. 85 grains of Pyrodex has been a very good combination with the SST's.