This is the law as it applies to carrying a loaded handgun:

RCW 9.41.060 "Exceptions to restrictions on carrying firearms.

The provisions of RCW 9.41.050 shall not apply to:"
(4) Any person engaged in the business of manufacturing, repairing, or dealing in firearms, or the agent or representative of the person, if possessing, using, or carrying a pistol in the usual or ordinary course of the business;
(6) Regularly enrolled members of clubs organized for the purpose of target shooting, when those members are at or are going to or from their places of target practice;
(7) Regularly enrolled members of clubs organized for the purpose of modern and antique firearm collecting, when those members are at or are going to or from their collector's gun shows and exhibits;

(8) Any person engaging in a lawful outdoor recreational activity such as hunting, fishing, camping, hiking, or horseback riding, only if, considering all of the attendant circumstances, including but not limited to whether the person has a valid hunting or fishing license, it is reasonable to conclude that the person is participating in lawful outdoor activities or is traveling to or from a legitimate outdoor recreation area;

(9) Any person while carrying a pistol unloaded and in a closed opaque case or secure wrapper;