Ah, the old vector hypothesis again.
I believe the observed speed differential refutes this.
The venturi does not accelerate all the pellets to the same speed. If it did, we would observe a cylinder of pellets the same diameter as the choke I.D., just going faster.
Stop action photos show an elongated shot column, which can only come from a speed differential.
The inward vector of the outer pellets forces the inner pellets out of the way, imparting both forward and backward momentum resulting in the longer shot string.
The 'sideways' energy is thus cancelled, the result being the observed speed differential.
Aero effects take it from there, the dispersal being delayed as compared to a cylinder.
That aero effects predominate is supported by the fact that very hard pellets (steel) don't require much if any 'choke' constriction to shoot very close patterns.
Thus, it would appear that deformed pellets (lead) fly straighter in turbulent flow caused by the leading pellets.
If there's any 'vector' physics involved it would appear to be 'drag' vector, trailing pellets flying in apparent wind different from the bore axis caused by the wake of the leading pellets.
Just my Humble Opinion Don. I didn't stay at a Holiday Inn Express last night either.
