Well, I learned something new the last couple of days with that number 65 stamped on the barrel saying it’s the chamber length! Decades ago I had the chamber measured by a gunsmith in town that told me it was a 2 7/8 inch 10 gauge chamber. A 2 7/8 inch RST shell drops right in the chamber and I’ve shot probably 30 of them without issue. After seeing that number 65 and listening to a YouTuber saying that’s the millimeter measurement in chamber size made me scratch my head because that comes out to 2.559 inches. I measured to the forcing cone today several times and came up with 2.775” on average. Well, I would assume that is with a 2 5/8 inch hole or 2 1/2 inch hole unfolded??? Explains why I never got a good pattern with the three boxes of two and 7/8 inch shells. It taught me how to get into 10 gauge shotgun reloading anyways because I’ve used those holes several times and they’re cut down probably a half inch shorter so they never came close to the forcing cones with my roll crimping. I have basically 2 boxes total of impossible to find 2 7/8” lead #5’s and #6’s. Thirteen 5’s and 6 #6’s. I sure would hate to tear those things down and just to reload them. I’m probably better off selling them out right or horse trading them for ammo I can use.
