I'm going down this path for a reason. First off, for any evaluation to have meaning, there must be standards. By that I mean any conversation on accuracy must have a measurable, quantifiable, repeatable method to measure accuracy and with that standard, you now have a gauge to determine and rank the effect of powder, cap, ball, patch, lube, etc. In simplest terms, what is documented to work best. Being able to hit a chunk of steel, while intrinsically satisfying, is not a good way to measure. Being able to harvest a deer, again, that can be done with a spear or a well placed thrown rock and not a way to quantify and rank results. Folks gush about Fadallah's book but all he's done is write a book on exactly what I'm getting at.
So is Pdex uncool? Not really. And by saying that, I know that there are folks getting good accuracy out of it with repeatable results and use it in many situations. Same can be said about using corrosive primers in centerfire cartridges but the cost of wear on the equipment is one thing that cannot be discounted with either. Will I use it? NO. I have used it a couple times from it's release, it has documented fouling and corrosion problems and I'm still not a convert. Of the subs, I prefer T7 but having a solid, steady source of the real deal, I'd be very hard pressed to switch. If you like Pdex, have at it, it relieves the supply pressure on those of us who use real black powder.
Your taking one aspect of the sport and saying all else isn’t worthy.
Let us say that a gun shot it’s best groups with 65 grains 3f GOex. Is this optimal compared to Swiss that tends to be a little hotter, or elephant that’s lower.
Experimentation in a double blind study may reveal that even shooting the same MV the GO does best, ie smallest groups at a given range.
Now I’m hard pressed to believe that if your best groups come at an average of 1650 fps the ball cares if it got there on top of Swiss or elephant or P. However, internal ballistics count, so acceleration ease of ignition and so on can make a difference.
Let us say that real powder can result in 25 % smaller groups at one hundred yards, is that the only consideration.
It is if that’s your game. Off hand, bench, woods walk or formal small groups is an advantage, but only in a formal match will that 25% count.
I shoot flintlocks. Big ‘slow’ French trade, smaller ‘faster’ silar German. That’s inferior to late British locks. The Penultimate ml locks. To improve on these one had to go to percussion
Seen from an outlook of ‘faster’ the late English is the best. But you can’t put an Egg on a early style Brown Bess or. Transitional style rifle.
A small group can be a qualifier for best, but only if that’s what your looking for.
P is cheaper, and easier to get. I want black but recognize needs. One doesn’t settle for less by shooting a 25% bigger group if it serves your needs.
I’m pretty sure I would improve my shooting if I put modern sights on my rifle, but that wouldn’t fit my needs.
Cost is important
Availability is important
Storage is important
Service is important.
And with v, silver blade and 65 year old eyes I could never get the very smallest groups my gun can produce
And no it’s not harder to clean p over holy. It is your responsibility to care for your gun, you can’t blame rust on any one but your self.