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I have a 2nd gen Colt 1860. I bought 2 lbs 777, and 1 lb AP Shockey's Gold. What is a safe and effective load (unless those are two different criteria) using these BP substitutes?
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For the 2nd gen 1860 Colt specifications are 25-30 grains (25 recommended) of 3F, #10 caps and a .457 rb. I shoot a 28 grain load in my Centaure, Uberti and two Colt 1860's. That is the happy spot for how I load. I have shot some 25 grain loads of triple 7, it is a hotter load than the 28gr of black.
mykeal's advise on the seating pressure of the triple 7 is spot on. If you compress it very much it does not like to light off. I had some hang fires to first time I loaded it and now use a loading stand when using triple 7 so I get a better feel of the seating pressure.