Bill,
I just picked up a 340 in 30-30. The action (bolt) opens smoothly and runs without any binding. Since these are "cock on open" actions, are you referring to the cocking action being stiff?

If that's the case you may have some old lubricant inside the bolt itsself. I would try first using a light oil (3 in 1) and exercising the action to see if that loosens it up. If not disassemble and scrub in ATF or other solvent oil being certain to lubricate when reassembling. JMHO (just my humble opinion)

Steve