It's not a PF issue.
The main reason SASS wanted an Open category, years ago, was to draw other, cowboy, shooters into WB.
WB was not bringing in the revenue spent on awards etc.
CAS shooters, who have now started shooting WB, didn't want to have to get a new rifle and shotgun. The cost of the guns for the amount of matches offered, didn't pencil out.
So SASS had to change things up and, in so doing, eliminated the PF for all rifles to allow .38's to play. Add in the '87 and SxS shotgun, more shooters could afford to play WB.
Enough WB shooters wanted the "big bore" rifles and pump shotgun, SASS decided to bring that back as "Classic".
Kinda funny, if the "powers that were" had just allowed an "open" category, none of this would have ever happened.
Rifle PF is only in Classic.
As far as clubs using rifle PF as a reason to not shoot WB, I say BS. 150pf for pistol is more damaging to a target, because of 28+ rounds vs 7-10, it's just a reason they want to complain.