Puncheon (unit)

The puncheon was a British unit for beer, wines and spirits. It was also an American unit of capacity for wine.

Definition
Historically, the puncheon has been defined somewhere between 70 and 120 impgal.

US unit of capacity for wine
The US puncheon for wine is defined as 84 usgal.

Conversion

 * 1 puncheon = 70-120 gallons
 * 1 puncheon = 0.318-0.546 m3 or 318 to 546 litres.

US unit of capacity for wine

 * 1 puncheon = 4/3 Hogshead
 * 1 puncheon = 84 gallons
 * 1 puncheon = 0.317974589856 m3 or about 318 litres.