What about barrel time and the effect of recoil on the P.O.I.?

A lighter payload at a faster speed will have less time in the barrel than a heavier payload at a slower speed. So wouldn't the dynamics of the barrel's movement impact the P.O.I.

Seems these variances between the barrels would be more difficult to manage with a double rather than with a single barrel shotgun.

PULL!
Hal M. Hare