@izzythepush,
Every museum on the Chespeake owns one or more punt guns and the "sneak boats" and "sink boats" on which to mount them. The market hunting of ducks and geese by such a method was officially outlawed in Maryland and Virginia during the 1920's when the ducks and geese stocks were severely depleted.
Every year, during summer festival days at the various museums (like the Northeast Chesapeake Bay museum, the HAvre de Grace Museums , St Michaels etc) all will have several punt gun demos during their festivals. Whenever they fire the things, they do it far out on the water so that people aren't allowed too close.
The story that they used to fill the barrels with stones and nails was all bullshit. These guns were handed down from generation to generation and needed to last because it was often the source of the only income that some watermen had during the winter months before muskrat trapping season.
The sound of a punt gun is unique, its like a deep thud . Since they used only gun powder the shot needed was usually like a number 2 to 5 shot (they didn't want to tear the ducks up and a larger shot would be needed for the geese.
When they fired these things the white trail could easily target the hunter . That's why they hunted at night on their sneak boats.
The Northeast Bay Museum in Northeast Maryland (that's the town name) has a punt gun set up on a fixed mount on a sneak boat in their boat shed. Its an interesting gizmo with allthe sand bags used for the recoil.
These things were kept at a very low angle since the hunters would sneak up on a raft of sleeping ducks where they sorta huddle up on the water.
I was told that the best targets were when the ducks all huddled on a patch of ice so that the hunter would sneak as close to the raft of ducks on open water and try to get a wide enough pattern (by distance) so to get them all.
They would gather up the ducks and put them in barrels cleaned and salted for the restaurants in DC Baltimore, Philly, and the ever popular Hotel DuPont's Gold Room where executive dinners were frequently held and wild duck with wild turnips and celeriac dressing was often the bill of fare.