Note that in the above figures I popsted that 1330 fps is 17.2% faster than 1135fps. The resulting increase in lead for the lower velocity is 12% for #7½ size shot & 12.8% for #5's. Thus again lead is "Not" inversly proportinate to MV, but is directly proportinate to time-of-flight. As the inefficent shot pases the speed of sound, drag becomes far out of proportion to it's increased velocity. Thus most of the indrease in V is lost over the first few yds.
The problem with the old wading was not in it "Catching up with & blowing a hole through the shot patern" but rather on it's being caught in the rapidly expanding gases being expelled from the muzzle & being "Tipped" into the rear of the pattern. Fortunately this was not the rule, but could & Did, on occasion happen. This occured just at exit & not some feet down range. When it did happen it caused a loss of "Cohesion" of the shot mass & a disrupted (blown) pattern.
PS: Love my litle Casio Calculator.
