I am now really confused. Can you shed some light on this, please?
In the past some well-respected writers have insisted that guns with identical chokes throw identical patterns, no matter what the bore.
That isn’t my experience, and all the small-bore guns I have tested have all thrown patterns a bit on the tight side.
However, some small-bore guns are choked quite tightly because you don’t get that much shot in the pattern, and with open chokes birds or clays could easily escape through the gaps.
Also, even if bore and choking are the same in two guns, there’s no guarantee that patterns will be identical.
This all brings us to the basic fact that the only true way to check on the pattern a gun is throwing is to fire at least half a dozen shots at a pattern plate.