I have an early 1980's 4 5/8th inch Blackhawk Convertible which shoots very well with .45 ACP 230 grain cast or plated bullet loads. It is not nearly as accurate with factory hardball. The ACP cylinder has VERY tight chambers. Loads that fit and function in my match chamber Springfield and Para Super Hawg would bind in the Blackhawk. I now use its cylinder as the final 'plunk test' for my lead 45 ACP loads.
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