Patterning will tell you the shot spread.
what you need is a Point of Impact test.
the one I use came out of a George Bird Evans book, (i don't remember where he said he got it)
set up paper at 16 yard from your eye, not the muzzle
put a small spot in the center of the paper at eye level
mount and fire as on a straight away bird, do several do make sure you are consistent
every inch the center of the shot is off from the spot is a 16th of an inch off in the fit
so 4 inches high is 4/16 too little drop at comb
4" low = 4/16 too much drop
4" left needs 4/16 cast off
the biggest problem is - if the gun fits - you need to come up with a new excuse when you miss
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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