While a wall thickness gauge to many is the final say in barrel measurement, don't sell short what a good bore gauge can discover. The Skeets bore gauge is once again available. Ebay lists them at $160 plus $15 shipping. At 12.5" long, it can be used to determine if the barrels have been reamed beyond what is considered out of proof by UK standards. While on a 30" gun, 5" in the center would be unmeasurable, but one would get a good indication of whether or not to move on or have measured further with a wall thickness gauge. Gil
