Cask sizes

Just a quick table about cask sizes.

Cask	Litres	Imperial gallons	US gallons
Bourbon barrel	159 (official barrel)		42	size varies 150-220l, commonly 180-200l
US beer barrel	117		31
UK barrel	164	36
Hogshead	250	54
UK ale barrel	146	32
Tun	955	210		"a ton"
Sherry shipping butt	491	108		30 arrobas,56 cases of 0.75l bottles or ½tun
Bota gorda, sherry cask	600			32arrobas
Sherry puncheon	667			40arrobas
Cognac	350			varies 270-450l
Cognac shipping cask	500-600
Bocoy	600-800			Spanish wine cask
Wine barrique	225			Bordeaux barrel
UK wine shipping barrel	119	26.25
Port pipe	528	116		varies 400-800l
Madeira cask	419-437	92-96
Marsala pipe	396	87
Marsala hogshead	200	44
Rum puncheon	410-455	90-100
Kilderkin	82	18		½ UK barrel
Firkin	41	9		Quarter of UK barrel
Bloodtub	34	7,5
Whisky quarter cask	125	27		½ hogshead
Whisky octave	46	10
Whisky puncheon	387-500	85-110		staves from 2 barrels

References:

Calabrese S. Cognac, liquid history. Cassell&Co 2001

González Gordon M. Sherry. Cassell Ltd 1972 
Kilby, K. The cooper and his trade. John Baker Publishers Ltd 1971
Rainbird G. Sherry and the wines of Spain. 1966