I always thought they were just different spellings of the same thing. Both were 27.3437 OZ

A Dram (or Drachm) is 1/16 of an once. An once is 437.5 Grains, so 1/16 of that is 27.3437.

Call it 27-1/3 grains for ease.

But I have never heard of 1 drachm being = to 60 grains.

Am I alone here, or missing something?