Quote:
Originally Posted by Andrew Sacco
If someone was to shop for a tool to measure this on the used market, what is the best tool?
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For my money, Hosford's gauges hands down. They are expensive but they are incredibly accurate. His bore/choke gauge uses tiny collapsible fingers (3). I have run some comparison tests against a c. 1970s ball gauge which uses 3 small spheres on the brass head, which has proven to be very accurate. The range between the ball gauge and the Hosford gauge has never varied more than .003-.005 for the some 50 guns I have measured with them. No mystery using his instruments (he also makes an incredibly accurate barrel wall thickness (BWT) gauge.
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