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First thing to do is slug the bores as there is a lot of variance in the 450/400s. My Evans 450/400 3 1/4 measured .408 but you'll want to check for sure. Get Graeme Wright's 3rd Edition and read up if you haven't loaded for British doubles before. I would try both 4831 and R-15 and let the gun tell me what it prefers. |