Would the centerline question be similar or maybe the same issue as "point of impact" found when patterning an over and under for Trap or skeet , which is usually compensated by comb ajustment? I would think a P.O.convergence could be found by using two laser bore sighters (generally for slug barrels) and find the distance at which the two dots might intersect on a patterning target. I have heard a few shooters complain that of their high end multi barrel sets not having the same convergence point. The o\u gun would change the target floating point if the clay is shot at the same distance. I would think a sxs is a lead and distance issue if one wants to center the target. Amazing how we miss a target with a 30" diam. pattern of flying lead , isn't it? I believe modern manufactured guns are "supposed" to converge at 40 yds. It would be interesting to know what the Parker standard was. I think that was before I.S.O 9000.
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