IMO Muley , being PC has nothing really to do with it considering the rifle  being chosen . 
 but thats neither here nor there as if we want to go that rough , then we have to say yes its PC  as the TC rifle was  marketed for a conical  and in a time when conical were being used  for hunting . So I guess it all depends on how fine a line  one wants to hold .
As many folks here know , I use both RB and conical in my  slow twist flintlock . What I chose is dictated by what and where im hunting . Most times  if im hunting on the canyon rim  for bull elk , then I chose a 435 grain 54 cal  Bernard Minnie. Not because the RB wont do the job but because  im hunting Bulls in the Rutt , at very close range , in an area where the difference between going 100 yards and going 50 yards can make the difference between getting them out  and  needing a Knife and fork . They 435 grain does a lot more damage , carries a lot more energy  and at very close range  often times puts even a big bull that’s all worked up ,   if not right down , within just a few yards .
 The rest of the time I  mostly use RB  as does my wife in her 50 cal ..
So is the type of conical I use PC for my rifle , I would give a hands down NO on that one . But is it accurate  out to around 75-100 yards  for hunting  and do I use them . Yep I do in my 1-70  hand forged barrel