Youtube on how to use the Hosford gage. Part one and two.
http://www.youtube.com/watch?v=1jQZn4kohH4

In using the gage to measure breech you need to lay it on a table and have someone hold and rotate barrel or else do it the way he does. In my opinion, not a user friendly way and again, my opinion, the most critical area we want to see wall thickness readings.


David