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A friend has several French revolvers marked 1873 St.Entienne..they were orginally a 11 mm.With a very small amount of boreing, He has bored them out to 45 cal.He has slugged the barrel to confirm the cal.
Problem is they were orginally black powder. What smokless
powder will approximate the pressures of a 45 cal 45 cal.
What powder to use and source of supply?
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