Joe, funny you mention about the right barrel caring about the shell. With my 16 ga, I had fed if everything, including now Gamebore black powder shells, without a hitch. That is, until I bought four flats of Fiocchi. The right barrel will not consistently fire Fiocchi shells. No idea why. How did your friend fix yours?

Btw, your three-barrel set sounds like a dream. That is one to treasure and enjoy.

Happy shooting.

Joe