Try steel shot. Not trying to be funny but it goes fast enough now there's really not much difference than lead, if any. But you have way more pellets for equivalent size so more in the pattern. #3 or #2's would be a good place to start. Fingers on the wads are longer to stop the steel shot touching the barrel ( said the man from falcon ammo) . That's why you need to run more open chokes to start the wad fingers opening sooner to pattern properly , your current problem using lead. I'd get a box of each lead and steel of same size and pattern at different ranges before playing with the barrel. You might find you could get to 30/35yrds with luck and the shooting gods willing.
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