JT Ward:
Nice gun. I have a 2nd generation Colt 1851 Navy too. With mine, .375 inch balls are nearly a slip-fit in the chambers.
In its brochure, Colt recommends a .378 inch ball.
I used to cast my own .380 balls but now buy them from Warren Muzzleloading of Arkansas, which makes a .380 ball without a sprue. It looks swaged, though I understand that it's cast and the sprue removed somehow. Anyway, these are very high-quality balls. Visit it at
www.warrenmuzzleloading.com
With a greased felt wad, I can get as much as 24 grains (by volume) of Goex FFFG in my Colt's chambers, and a lead ball. Without the wad, 27 grs. Either load hurls that 82 gr. ball at about 1,000 fps.
A good target load is 20 grains, with a greased felt wad.
I prefer Remington caps; CCI caps seem to have more misfires.
If your Colt is like mine, it will shoot about 6 inches high at 25 yards.
I've put about 2,000 rounds through my Colt 2nd generation 1851 Navy. The wedge needs to be driven in farther than before, to keep it tight, but it still locks up tight.
The blue finish is long gone, replaced by a nice, grayish silver patina that makes it look like an original.
The silver plating on the grip frame and trigger guard still looks like new, showing no sign of wear. Apparently the silver plating is rather thick.
All parts are original, except the screw holding the wedge (lost that years ago but it was quickly replaced). I'd suggest buying a spare screw assortment from Dixie Gun Works, to keep it shooting should you lose a screw.
You've got a great gun there. Treat it well and it will last for generations. Neglect it, and it may not last a month.