RocketMan
You are the guy with the golden pencil. We all rely on your computations as a firm starting point.

I think some of these questions relate to the possibility that what goes on in the gun before it gets to the choke determines a degree of the tightness of the pattern.

Someone mentioned the fact that it was commonly believed by earlier generations that a short chamber increased the tightness of patterns in trap guns. I think that is largely disputed, but the owners of those guns were not easily convinced. How do you feel about that?