That's a nice full choke pattern, Dave.
.020 or not, it throws a full choke pattern with that load.
Not too unusual really.
The larger shot responds to choke differently than real fine shot. Less can be more, even with 5's and for sure with 4's.
20 gauge 3" Fiocchi 'Golden Pheasant' #5 looks just like that out of my Beretta with .020" 'Mobil' chokes. It's a splendid pheasant load.
I believe there is no question that a crossing target does not 'see' what we see on a 2d pattern plate, but unfortunately the 2d pattern is most likely 'best case'.
There's still research to be done on that.
