There is still a power factor for rifles; it is 60, as stated in the rules. There is also the 1911 power factor, 150.
Power Factor could still be checked at State and above matches, especially with the newer, more easily set up chronographs.
At the Club level, one would not need to meet power factor, whatever it might be, in order to "get shooters interested." But should they go to a "Big" match, ammo might have to be changed.
Cowboy Action was always Revolver(s), shotgun and RIFLE. Wild bunch Action Shooting should continue to be 1911, shotgun, and RIFLE. As in CAS, the rifle shooting may be less difference from shooter to shooter, it is still important with the shooting as well as the transitions.