Problem solved.
I cranked the action off with a strap wrench (did it before I saw 243LPR's reply. I guess great minds think alike :) ).
There was a buggered up thread from a slightly too long scope base screw preventing it from easily spinning. Once I got past that, everything was golden.

Thank you everyone for the suggestions and support.

Also, I didn't see any blasting media in the threads on the action, nut, or barrel.