Black powder, used in muzzleloading firearms must be packed, stored, and transported in U.S. DOT approved shipping containers.
Wash. Admin. Code § 296-52-71075
Statutory Authority: RCW 49.17.010, [49.17].040, and[49.17].050 . 02-03-125, § 296-52-71075, filed 1/23/02, effective 3/1/02.