I once owned a Boswell BLNE, Pigeon gun. It came out of Australia.
I couldn't hit a thing with it.
Off to the pattern board to see what was up.
Both barrels were regulated for 18" high.
Think box birds, aim at the bird, the rise is built in.
I sold it to a clays shooter that had Briley add chokes, to fix the built in rising pigeon chokes

I should have kept it.

Joe