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http://www.fws.gov/le/pdffiles/50_CFR_20.pdf§ 20.21 What hunting methods are illegal?
Migratory birds on which open seasons are prescribed in this part may be taken by any method except those prohibited in this section. No persons shall take migratory game birds:
(a) With a trap, snare, net, rifle, pistol, swivel gun, shotgun larger than 10 gauge, punt gun, battery gun, machinegun, fish hook, poison, drug, explosive, or stupefying substance;
(b) With a shotgun of any description capable of holding more than three shells, unless it is plugged with a one-piece filler, incapable of removal without disassembling the gun, so its total capacity does not exceed three shells;
Washington state law prohibits the hunting of any game bird with a shotgun capable of holding more than three shells.