There is an interesting thing about those charts, tho'. If we accept that, let's say full, delivers a certain percentage of its' load inside a 30" circle at 40 yards, then look at what constriction is required to make that happen in each gauge.
As the bore size decreases so does the amount of constriction necessary to make that gauge deliver the desired choke pattern. For example, look back at the chart posted above by JayCee and you will see that for full choke patterns .035" constriction is required in a 12 gauge, but for a 20 gauge only .025" is needed. Thus, the old axiom that, as a general rule, 20s shoot tighter than 12s.
As we know, each gun is it's own rule, but the general consensus is that the smaller the bore the tighter it shoots.
SRH
