The entire WAC:
WAC 220-414-060
Muzzleloading firearms.
(1) Definitions.
(a) Muzzleloader: A firearm that is loaded from the muzzle and uses black powder or a black powder substitute as recommended by the manufacturer for use in all muzzleloading firearms.
(b) A muzzleloading firearm shall be considered loaded if a powder charge and a projectile, either shot or single projectile are in the barrel and the barrel or breech is capped or primed.
(2) It is unlawful to hunt wildlife using a muzzleloading firearm that does not meet the following specifications:
(a) A muzzleloading shotgun or rifle must have a single or double barrel, rifled or smooth-bored.
(b) A muzzleloading shotgun or rifle used for deer must be .40 caliber or larger. Buckshot size #1 or larger may be used in a smoothbore of .60 caliber or larger for deer.
(c) A muzzleloading shotgun, rifle, or handgun used for all other big game must be .45 caliber or larger.
(d) Persons lawfully hunting small game with a double barrel, muzzleloading shotgun may keep both barrels loaded.
(e) A muzzleloading handgun must have a single or double barrel of at least eight inches, must be rifled, and must be capable of being loaded with forty-five grains or more of black powder or black powder substitute per the manufacturer's recommendations.
(f) A muzzleloading handgun used for big game must be .45 caliber or larger.
(g) A handgun designed to be used with black powder, including black powder percussion revolvers, can be used to hunt forest grouse, cottontail rabbits, and snowshoe hares.
(3) In addition to the above requirements, it is unlawful to participate (hunt) in a muzzleloading hunting season using a firearm that does not meet the following specifications for a muzzleloader. However, a modern handgun may be carried for personal protection. Modern handguns cannot be used to hunt big game or dispatch wounded big game during a big game hunting season for muzzleloading firearms.
(a) Ignition is to be wheel lock, matchlock, flintlock, or percussion. Primers designed to be used in modern cartridges are legal.
(b) Sights must be open, peep, or of other open sight design. Fiber optic sights are legal. Telescopic sights or sights containing glass are prohibited.
(c) It is unlawful to have any electrical device or equipment attached to a muzzleloading firearm while hunting.
(d) Those persons lawfully hunting big game with a double barrel muzzleloader may only keep one barrel loaded.
(4) Muzzleloading firearms used during a modern firearm season are not required to meet ignition, sight, or double barrel restrictions.
(5) A violation of this section is punishable under RCW 77.15.400, 77.15.410, or 77.15.430, depending on the species hunted.
