Craig, what Galazan bore gauge are you referring to? I use Galazan's $450 bore gauge because it will measure ten gauge bores, where the Skeets type three ball gauge will not. I have both sizes of the Skeets type three ball, bought from Tony many years ago, and the $450 gauge bought a couple of years ago. I think it can be converted to measure eight gauge bores and chokes with a little machine work.