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Hello, unclekuster. I have been shooting cast in my custom Shillen barreled Hornet since the late 90's. Twist is 1-14". I have had excellent accuracy using H4227 powder..this has since been discontinued..not sure about the "new" IMR 4227. I have been able (sometimes) to equal best jacketed bullet accuracy at 100yds. But on average I would say 3/4" to 1" is average.
I have tried all the faster shotgun type powders Lyman's book lists..but I get alot of fliers from those very small charges.
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