Pete,
I can't pattern those Parkers because it's illegal to shoot lead at Canada Geese!
Honestly, I'll get wrapped up into pressure testing and such but for patterns, I accept that if it kills the game at the selected range(s) the patterns are effective! As unscientific as this seems, this systems works for me!
Statically, any of my Parker 10's from lifter to hammerless, provide similar results on geese. All those Parker's have choke constrictions of about .030". I have a couple LC Smith 10 gauges with constrictions of .050". With them, I did not have the same success.
The way my brain analyzes everthing, if I were to pattern my shotguns then for every target that I shot at I'd be having a bout of paralysis by analysis!
Like Tuco said, "If you're going to shoot, just Shoot!", or something like that...
Mark