Well Mark it was a long time come (and a rough road too) congrats that everything finally came together.

With a 28 gauge shot cup exiting out a 20 gauge muzzle, what kind of patterns are you getting? I would imagine it would be something similar to "spreader" loads.

I believe this has full length 28ga inserts now.

8 inch liner inserted and welded at breach. Choked barrels to I/C MOD. I did not pattern on a board. I patterned on a sporting clays course with 5/8 oz RST. Shot the yellow (smallbore) course here. Targets inside 30 yds. Still plenty of choke in both barrels. Clay targets were broken well - not just chipped. Also reached out to 30 + yds. on quail but better with 3/4 oz load.
Fun to shoot. I don't shoot spreaders. I have not had good luck with them when I tried. Inconsistent - holes in patterns. I felt very confident with this gun. when I was on them they fell.

Must be you got that lockup fixed on it?

Still tight to open and close. Wearing in with use. No lockup with RST

Could be thickness of the rim of some shells. Had that problem with my DH Damascus. I know Bill M. recommended a reamer and make a pass or two to correct the problem but I didn't because I wanted to keep it totally original. But others have had good luck with doing it.

That's my experience with spreader loads too. I stopped ordering them.

Same here.

I don't like spreaders either.