Restoration of antique muzzle loading shotguns come in three categorys, good ,fair, and poor. The good ones are those in pristine condition most are cased with accessiors these requiry no restoration , Next come the fair ones , most are in a dirty condition with a few dents to the barrels and maybe a small chip in the stock.These can be easly restored the crime can be removed with mild wax remover solution the checkering can be cleaned with a tooth brush ,dents are then lifted and chips in the stock filled with a wood filler,this is a type of restoration that is easly taken too far by some restorers ,such has recutting the checkering there is nothing worse than a 150 year old gun with crisp checkering ,there is a rule that restorers should apply which is if in doubt leave it be.
The last is the poor ,most of these are scrapped and broken up for spares ,I do believe that with a lot of patience and carefull restoration most of these can be restored ,they are part of our gun heritage which we must account for future generations.I have enclosed images of the poor type before and after.
Feltwad
A Flint Lock will not secure a chicken house door