Okay, here's the research:
ORS 166.170 is state premption
ORS 166.171 through 166.176 state the EXPRESS authorities granted by the legislature to regulate firearms.
OAR 629.025.0050 does state what the sign says but is pre empted by state law and VOID per 166.170 and therefore unenforceable. HOWEVER, it's still there so that the anti's can claim "we didn't know" and cause hassles for those that do and don't bend to their whim. We need to contact ODF and demand that they remove the OAR.
OAR 629.025.0060 doesn't have anything to say on the subject other than that you have to observe the rules in 025.0050 which are VOID as pertains to possession of loaded firearms.
ORS 530.050 is listed as the "authority" for the rules but a check of that ORS does not reveal any authorization to regulate firearms and it MUST BE and EXPRESS AUTHORIZATION by the legislature. Simply saying "make the rules" doesn't constitute EXPRESS authorization and so they are wrong.
Here is their e-mail (not the local district where it was posted but the state offices).
mailto:information@odf.state.or.us