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Pacific Tool & Gauge muzzle erosion gauge

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    Pacific Tool & Gauge muzzle erosion gauge

    I receive this gauge w/o any instructions. In using on a almost new barrel it measured 0.315, whatever that means. I have been using a Foster throat gauge which is tapered, as one would expect. This PT&G is not tapered, it measured 0.299 its entire length. Can anyone give me information or a source for a good muzzle erosion gauge. Thanks.
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