this is from a 1865 Colts instruction

Colt is giving the powder charge in drachm or dram and there are different so its not eays for me to decide which one is the right.

wikipedia have different and most logical would be for me to use the apothecaries system for gunpowder but 60 grains for a dram is to much.
https://en.wikipedia.org/wiki/Dram_(unit)

the common dram is given with 1,771 gramm or 27,27 grains and seems to be the right one. is this the drachm used by colt in 1865?