When I had a gun made by Grulla (working with Terry Wieland), I went with a 12 gauge on a 20-gauge frame. It's just slightly over 6 pounds with 29-inch barrels.

Not for heavy loads, of course, but it's delightful.

At some point I want to get a 28. No practical reason . . . thank goodness! Isn't it great that we can get guns "just because"??