[QUOTE=Robin Lewis;132674]Here is a video in which Larry shows how to measure a 11 gauge chamber so he can make custom brass shells to shoot. It would be a good guide to find out what gauge you have. He measures the chamber at about 3:40 into the video. I hope this help.
Very interesting video, Robin. Yes, this helps tremendously! I'm just wondering if a cast of the chamber is necessary rather than a direct measurement, although I suppose that would be rather difficult and prone to error. With the cast, you can take a direct measurement and be assured your results are accurate and repeatable.
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