Parabola, You check POI to verify your gun is shooting to the point you are aiming (looking) at. Best way to do that is to do it exactly the same as how you normally shoot. Same mount, same bead to target relationship. It also confirms your stock fit, to a large extent, but stock fitting is a lot more complex than just POI. POI can be fine tuned by stock fitting alteration but not fully. And POI verification on doubles also needs to check convergence which if off can be a much more difficult thing to correct. When hunting or target shooting I agree to focus on the bird, not the beads. Most people who focus on the beads will aim their shotgun like a rifle, with no follow through, which is never a good thing with a shotgun. I always checked POI at 16 yards because the patterns are still tight and well defined and the basic rule of thumb was every inch of correction required about 1/16" alteration of the stock. So a gun shooting four inches high at 16 yards would have face/comb adjusted down 4/16" (1/4") and then retested.
If you have ever been correctly fitted for stock fit, by a good stock fitter, you can have a basic set of numbers to start off from. Then measure your stock and see what difference there might be. If you know your stock is higher than your norm check POI to make sure it shoots high in fact. Not every gun will shoot the same even with the same stock fit. Weird I know. The other option is to alter your shooting style with that gun if you do not want to alter the stock. If you know your gun shoots high carry the target well above the bead. Sometimes a gun is too valuable to start hacking on the wood.
