Can someone recommend the most cost affordable 12 bore solution to bore diameter and wall thickness gauges sold turn-key?
There is some difference of opinion on wall thickness gauges. The Manson that is available from Brownells is the least expensive. The Manson was designed to be used in the vertical position. Eightbore has been using it in the horizontal and apparently so have others. My shooting student Joe Wood, who introduced me to the Truth Tool, and I both think the Truth Tool is the better tool although it costs $200 or so. It was designed to be used in the horizontal, to hang the rod in the end of the barrel for zeroing, and is light enough to take into gunshows. There are those here whose opinions I respect that like the Manson and Hosford better. The Hosford gauge is about $500 I think.
Here is a link to a discussion that occured over in the classifieds:
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=214417#Post214417 It has a link to the Manson and contact information for Johnathan Pool who makes and sells the Truth Tool.
Best,
Mike
