I've not read Jones.

Did Jones discuss 3 dimensional considerations in target hit probability?

Even at skeet, the effect of the length of the shot swarm is not negligible.

Given a 3 foot length of string, and a 58 fps target, the target would appear to move 2 inches during shot cloud passage. Low 3 and high 5 are both 90 degree deflection shots.

It ain't much, but it's half a target diameter.

If the shot does not all get there at the same time, 2D patterns would seem to have little correlation to target hit probability.

We need statistical modeling in 3 dimensions. Did Jones do that?

"The price of good shotgunnery is constant practice" - Fred Kimble