OP, glad you are getting a good outcome from PC.
I have been casting and reloading but just a few years, read about the lubes and could not "find"
the best lube to use for all my firearms. Now I did not have the money to buy a lubber sizer, all the lube
or make all the lube to test with. So I went with tumble lube, fair results, leading up some but not bad.
Then this powder coating came up, I read the posts and after a few months picked up a bit of
powder. All leading went away, and groups got a bit better. I am not a great shot, I do fair.
So I can not say that PC is better or worse, just good for me, and for my firearms.
I have been waiting for the guys that have been shooting lube for years to test
PC to get the answer about "better" than lube.