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Old July 10, 2012, 05:49 PM   #6
James K
Join Date: March 17, 1999
Posts: 24,160
Sounds like he used a gauge I didn't mention, a plug gauge. A plug gauge is simply a precision made cylinder of steel the same size as the bore (so it is sometimes called a bore gauge). By pushing it down the barrel and feeling for areas of greater or lesser resistance, the size of the bore, or more accurately, its consistency, can be measured. Bore gauges were once used in factories and in proof testing (that number on the barrel of a German Luger - 8.8 for example - is the size of the bore) but today are replaced by air gauges in the factories.

Jim K
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