AFAIK, the rear sight dovetail is not tapered on a 1911 slide. There might be a slight lead on the right side but the cut is not tapered so you could drift it out either way. If the cut was tapered, how could the rear sight be adjusted for windage?
YMMV, VWP, NVIAS, NWEI, CCBS, LS/MFT and TttttAF.