Not Ted, but a slug normally is of lighter weight & with a higher velocity than the standard shot charge for the gauge. Thus bbl times are different & undoubtedly bbl vibrations are also different. If the load "Always" went to exactly where the bbl was pointing at the instant the trigger was pulled all doubles would cross-fire & would never hit point of aim.
Thanks Miller, didn't mean to limit the question to Ted. Understood about shot charge weight and velocity, and I noted these being equal in my question. Since this match is missing for a gun meant to shoot heavier/slower loads you'd have to determine whether their calculated recoil differs and allow some variance for this. Considering the effort the question becomes academic I guess.
I didn't consider barrel vibration, not thinking factors affecting minutes of angle levels of accuracy were in play for shotgun distances.
Jay
