Update...chambers are measured at 2 3/4". The load was found in the Hercules 1992 powder/load catalog. Gotta love those old booklets that were published by the powder companies. Fiocchi hull, 19.5 grs of Unique, PG16 wad, 1 oz of lead 7.5's. 7900 lup, 1150 fps. This is the lowest pressure load I could find.
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