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Join Date: Dec 2018
Location: Southeast Pa 5D
Great plains 385 gr bullets are on the order of a mini base with an upper bearing band which is roughly bore sized.
They are designed to be shot as purchased, the powder on them is the factory lube, and the fit should be fairly snug, not tight. As I remember they were pretty accurate with a moderate powder charge, my .50 liked 75grs of FFG.
As for patching it to use in a 54 cal, probably not a very good plan. There is a 54 cal version available, but I have no experience with those