Free: Contests & Raffles.
I think you've got to go farther east to start getting into the crosses. Rimrock and Cowiche have blacktail/muley crosses, and maybe some that are more blacktail than muley, so in my opinion anything in the Packwood GMU is pure blacktail. (during hunting season at least) I could see some muleys being in the far eastern edge of the Packwood GMU during the summer.