Feltwad, I have tried plastic shotcups made fer blackpowder and they do leave plastic behind in the barrels. They made no difference on the donut patterns I was getting so I gave that up. Never knew the plastic could ripple a barrel.
What do you know of the load chain the old timers used for those big duck guns? They wanted the pattern to be wide I'd guess but......not too wide.
I have a few ingenius things to try to improve my shotgun patterns and hope they won't be as stupid as the other ingenius ideas I've had on the subject.
Theory has it that a muzzleloading smooth bore should have patterns tighter than the cartridge shotguns because the muzzleloader shotgun has no forcing cone to deform the shot. The wads are the achiles heeel though. Wads in front and behind in a muzzleloader are less ideal than the wads in a cartridge that lets the shot free fly because there's no barrier of wad in front of the shot.
Anywhooooo.....the best way I know right now to improve the patterns is to use too much shot in the load chain. That must be what the old timers did with those big market hunter duck guns.
What load chain does the Goose hunter with the Chambers New Englad gun use? Didn't say or I didn't see it here somewhere.
I can't get U-Tube with this dial up I have. Well maybe if it had a whole day to load and....the connection somehow didn't disconnect.
I've had one single barrel shotgun muzzleloader with the 36 inch barrel I used for awhile and three Pedersoli doubles a 10 ga. and a 12 ga. and a 12 ga, with the screw in chokes. They all thru wide patterns unless I overload them with the shot. The 12ga. with the fixed choke did the best. They have accounted for hundreds of rabbits. I never over loaded the rabbits with shot sos they was eatable.
Did I spell that right?