I agree with all of you.
NitroX, it would be nice if I could afford a Double Rifle with 3 barrel sets as you suggest. As long as I had a spare set of Locks and Strikers for that rifle.
As RobertD says you could always regulate your one Double with 2 or 3 different weights of Loads and have a 20g barrel for birds.
Mick, Just out of curiousity, what yardage are the Express Sight leaves marked on your 303 Watson Bros Double Rifle? What is the farthest you have shot it accurately? As a Double Rifle, is it accurate at 250 yards? I understand that the old hunters claim that every animal in the world has been taken with that caliber.
Best Regards, Wes.