For a Lord Nelson and HMS Victory style use Yellow Ochre for carriage paint the Barrel and hardware black,
Here is my SAMCC gun done up in in a Bronze barrel in Nelson colors.
Different countries used different colors. Red was used as was black.
For many year I had my 1841 Cairo gun done up like this.
I did not know what the proper color was.
A few year back I learned the color of the original carriage was black so I did a refurb and this is what it looks like now.
Makes a big difference.