Quote:
Based on the current bore diameters, the "ringed" bores may be the result of coarse honing. 12 ga. should be around .729"


Maybe, maybe not. Lots of early Parker Damascus 12s were way over .729 from the factory. .745" is not that uncommon in original barrels, and I think some have reported over .750" on original 12 ga barrels. Murphy?