The OP's question mentioned mitigating wear and tear. If using the correct lube to reduce the potential of this happening what is the issue particularly when futher treating a Barnard action is probably neither feasable or practical?
Had a shooting collegue who switched barrels on his Barnard sometimes twice a day (depending upon ranges shot) every Saturday during the fullbore shooting season - 6mm to 6.5. He used a quality lube and I am not aware that he had any issues.
Maybe the OP would be better giving Steve or Matt a call at Barnard and ask their opinion? They would probably have a better idea than us keyboard experts.
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