I didn't come home with any Colts but I did find a nice refinished Marlin 1894 in .32-20. The serial number dates it to 1899.
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I also found three boxes of Black Hills .32-20 at $25 per box, which is about as cheap as it gets. It is a 115gr bullet at 800fps, presumably from a revolver, which about the ballistic equivalent of a .380ACP. Shooting it out of a rifle should add a couple of hundred fps to the muzzle velocity though. I will be interested in chronographing it out of handgun and rifle to see what the difference is.