I presume that you have already tried some factory WC as a "control."
No I have not, but I know my load shoots, I have a Clark Custom PPC gun that he built for me in 2010, which I use at my clubs PPC matches.

I presume that you have already tried some factory WC as a "control."
Glad you found the problem. Clear front sight is the key. I just love those Aristocrat ribs on a model 10 with Pachmayr or Bill Davis grips. Nice gun.
Regards,
Guy -