smoothshooter
50 Cal.
And I honestly feel like I'm doing my best to see if the new brass frame Colts actually "shoot loose". I have 3 brasser .44's that I don't make any effort to keep loads light in, and I shoot 20-30 grains of bp, or pyro , it doesn't matter. Apparently Pietta uses a better brass alloy that actually lasts now
Common brass is an alloy of 66 percent copper and 34 percent zinc.
In past centuries, a little tin was added to the mix for extra strength for some weapons ( called Gunmetal when used in firearms ) I am not sure what alloy Winchester used in their 1866 lever action rifles, and there are conflicting reports as to what the current Italian gunmakers use in their brass framed guns, ( the stronger Gunmetal, or common brass? ). They seem to be pretty vague about that subject when asked.
I would guess someone, somewhere; has done an electron spectrometer analysis test on some of the current reproductions to find out for sure, but i have not heard what the results were.