Yep, I think the Colt "Baby Dragoon" takes a .310" ball, but I'm not sure. I used to have one, and I think that's what it shot.
Anyhow, it was a fun little gun, but almost "too small", frame/size wise. It would be neat if they made the 1862 in .32 calibre.
A .36 calibre Navy Colt, or Remington Navy would be a neat companion sidearm, even though it is not of the same calibre.
I'd kind of like to have a .38 calibre rifle, that shot the same .375" balls that my Remington Navy does.