Irish Tom, fired a service charge of fifty ounces, roughly equal to a box of heavy 12 bore wildfowling cartridges.
Irish Tom is 14 feet 1 3/4 inches (4.31m) of punt gun, weighing 300lbs (136kg) and once firing 3lb 2oz (1.4kg) of shot, propelled by 10 ounces (283g) of black powder.
In the 1930s the gun was bought from a professional wildfowler in Ireland by Stanley Duncan, founder of BASC's predecessor WAGBI (The Wildfowlers' Association of Great Britain and Ireland). It was regularly used by by Stanley Duncan from 1936 until the second world war. After that it was acquired and used by actor James Robertson Justice during his many wildfowling exploits on the Wash. It even spent a night at the bottom of the river Welland, to be retrieved at low tide the next day. For a number of years the gun was lost, but is believed to have had a brief incarnation as a builder's scaffolding pole. Now of too large a bore to shoot waterfowl legally, it was rediscovered in an Inverness boatyard in 1981 and restored before being presented to BASC.