This video, part of the Jack Rowe Master Gunsmith Series, focuses on understanding European proof marks and measuring shotgun chokes. It details various national proof marks, including German (NICK), Belgian (PV with a lion), French (PT and crowns), and Austrian, emphasizing the importance of identifying 'Nitro Proof' or 'NP' for modern ammunition safety. The video also demonstrates the use of choke calipers and ball gauges to measure choke constriction, highlighting typical English gun configurations where the right barrel is more open than the left.
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