I'm having this issue with a .40 full size I just bought. I'm a right handed shooter, so any errors in trigger press will manifest themselves in a low left group. However, this gun shoots high and right (off sandbags, at 15 yards). Like 4+ inches right. Looking at the rear sight, it appears centered in its dovetail. The front sight also appears centered. I will try drifting the rear sight to the left to see if I can correct the windage error, but it doesn't look like there's much room in the dovetail to work with, unless the sight is going to hang out the side of the slide.
I'm almost wondering if this is a barrel to slide fit issue.
The groups, however, were very good. Factory ammo was grouping 1.5" at this distance, and a handload of mine using a 155 gr. lead round nose bullet over 5.0 grains of HP38 put 4 out of 5 shots into a ragged hole, with the 5th being 1" away (probably me).
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