The Colt 1860 revolvers always shot high, when a should stock was placed on the pistol it will shoot dead on. Why this is so I do not know.
I have a "Armi San Marco" 1860 colt I had the cylinders bore to .470 to match the bore diameter after having the barrel slugged. I have bullets cast at .475 from a custom mold.
Spectators at the range as amazed at the accuracy of the ole' colts.
Doc
