Russell,
Is your 10 gauge Parker a "lifter" or top lever? I have an 1881 10 gauge with Twist barrels on a #2 frame that is a lifter. As I understand it, Parker introduced the toplever in 1881 as well. Do you have a regular forcing cone or is there a "step" from the chamber to the barrels? I first shot mine with black powder loads. While at the Southern in 2006, Morris Baker of RST Shells gave me a hand full of low pressure 2 7/8" nitro 10 gauge shells. Boy did they shoot great.
Harry
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