Ichy - you might want to check the regs on that...I'm no Game Law attorney, but I don't think citing the RCW gives the complete story.

On page 55 of the Big Game Regs, it tells you that (1) while ML hunting, it's illegal to carry or possess a firearm that doesn't meet the ML specs, and (2) while archery hunting, it's illegal to carry or have in possession any firearm while in the field.