Bart, the table testing you described will also show a bent barrel. Did he do anything else to check for straight? Was the win 70 barrel on an action? If so how did it shoot? If it shoots well that would show us if slight differences affect accuracy much.
I would expect that larger differences in lighter barrels would make more of a change in accuracy, particularly as the barrel heats up.
You can't fix stupid....however ignorance can be cured through education!