The small cal rilfes of the time also had such double duty molds all I have seen, heard, read just suggests that the ball was the most used choice between the two,in rifles or revolvers though both projectiles were available probably due to it using less lead being easier to load and the tendency for newer things (conical bullets) to be slow to catch on and overtake the long standing items in use.The conical bullets were a fairly new thing in the first decade of the '51 Navies use for mostpeople, probably more so on the western frontier, I can see how a premade cartridge could be easier to make with a conical rather than a ball if it were all rammed down at the same time after tearing the paper at the bottom enough to expose the powder to the cap, these might be more delicate and subject to weather and damage though so I do not know how practical they were in some situations, at any rate I think that overall the ball was the most common thing used in most revolvers early in the revolvers time, but I have been wrong before, it was back in late Sept 1970 as I recall :idunno: