I'm sure a lot of folks have experienced this frustration.
The most accurate load is never the one I want or that I'd like it to be. And it seems it is always one that is not readily available or wildcat, etc.
Not much you can do about it. Really, nothing you can do about it but accept it.
Case in point, my PC-13 shoots adequately with most factory loads, but with PMC there is a noticeable improvement in accuracy. Say from 3" - 4" at 15 yards to 2". That's significant. Only thing about the PMC is that I don't like its reported terminal ballistics.