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I doubt the fault lies with the powder. Nearly every shooter using the big bores loads with H110 or it's twin W296. This sounds more like a bullet fit issue. Have you slugged the bore and the cylinder mouths yet? I willing to bet that there's a problem with the size of the bullet in relationship to the guns dimensions. While powder selection can have a small part in the accuracy of any given load this sounds like a bigger problem than that.

Let us know what you find so we can help you get this cannon shooting

MT Callahan
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