Matt:
Much of your calculations have have already been reasoned out in:
The Mysteries of Shotgun Patterns by Oberfell and Thompson.
I recommend a copy.
And... how the stock fits -- or doesn't -- a person will alter the POI as indicated above. So will the load, shot size, etc. Lasers will only show you where the gun points with a laser -- not necessairly with a fired shot cartridge. It's a maddening game. Best to stick with one gun and get used to it if that's a concern.
Best, Kensal
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