Even though a .410 is measured in caliber, not gauge, it is considered a shotgun and is legal to use while hunting game birds in Washington. A .410 is smaller than a 20-gauge shotgun.
It is unlawful to hunt game birds with a shotgun larger than a 10-gauge (WAC 232-12-047).
Game birds cannot be hunted with a handgun or rifle, with the exception of blue grouse, spruce grouse, and ruffed grouse (WAC 232-12-047).
6th of November, 2015