Do you case gauge the reloads? Alternatively - pull the barrel on the pistol and drop the rounds in the chamber, do they drop seamlessly?
I've found, with National match or other firearms with tight tolerances that my reloads must pass through a case gauge with zero problems. It makes sense when you think about it. To get great accuracy you must have tight tolerances, for reliability you need looser tolerances. Hence the reason we saw Military issue 1911's that fed anything but groups were marginal. Whereas custom build 1911's were tack drivers.