Quite often, penetrating oil will take a while to get into threads... especially 100 year old threads that are packed with crud and burned powder residue. Patience is a virtue, buggered bushings are not.
As has been discussed here many times in the past, all penetrating oils are not created equal. If one does not loosen things (or thingies) try another. Heating a round copper rod about the diameter of the bushings and using the hot rod to transfer heat to the bushing may help break the bond. Tapping with a small hammer and a brass drift may also help the penetrating oil get to the bottom of the threads. Watch that all this oil soaking is not allowed to drain back into the action where it will migrate into the stock head.
I have had stubborn parts resist disassembly for weeks, and then found that after soaking with penetrating oil for a couple months that they unscrewed easily. Rushing and improper techniques are not the way to proceed.
