Out of the three for USPSA major PF loads, I would use WST and Bullseye but not Unique as you only need to push 717 fps for 165 PF (730 fps for 170 PF) which is below start charges at less than 14,000 CUP and not sure if Unique will produce consistent enough powder burn for accurate loads.
But if using WST, keep in mind that WST is reverse temperature sensitive so loads you develop now in colder temperature will shoot slower in hot summer weather so would need to rechrono your loads to meet PF requirements.
Bullseye is temperature sensitive but not as bad as W231/HP-38 so you won't have to worry about meeting power factor requirement as your load will shoot faster in the summer heat -
http://www.thehighroad.org/showthread.php?p=10117881#post10117881