After the scope ring thing I finally got back to the range to work things out.

Two outings yesterday. First was over to the Beretta sporting clays course in Dover plains, NY where I shot a round with it.
At nearly 7.5# its heavy for a 20ga but it patterns correctly and balances about 3/4" in front of the hinge. There were no problems on any shots within 25yds and I was able to connect on some farther shots but I have a feeling that the main limitation was the shooter.
All stages included using the rifled barrel as my first shot. I dusted enough clays with that one to say that the patterns weren't getting blown either.

A trip to the range yesterday afternoon to check regulation wasn't an unqualified disaster, but the amount of leading that had built up in both barrels was an issue (8" 50 yard groups) so after a thorough cleaning it went out again this morning.

That is 3 right and 2 left at 50 yards.
3.75" spread so it looks like I'll have to do some regulation this afternoon and try it again tomorrow.
After that I can shoot a round of trap to see how that works out.

Tom