Stan;
Can't help with your problem there. I know that it can be done but to do so one has to "Intentionally" take more out from the side you want the pattern to move toward. If one "Correctly" just opens the choke keeping all in line then shot placement should not be changed.
What I did want to ask about though, was this just a slip up;
"Does the same exact thing with 2 3/4", 1/2 oz. loads."
I wasn't aware there were any 2 3/4" .410 shells, all I have ever seen were either 2˝" or 3". Well I have seen a few Very Old 2" ones.
