Put a patch on a jag on your cleaning rod (a cleaning rod with a swivel handle, NOT a USGI type).
Mark top dead center on the rod.
Push rod down bore.
When the top dead center mark rotates back to the top, measure the distance the rod has advanced.
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Senior Member
Put a patch on a jag on your cleaning rod (a cleaning rod with a swivel handle, NOT a USGI type).
Mark top dead center on the rod.
Push rod down bore.
When the top dead center mark rotates back to the top, measure the distance the rod has advanced.
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