Question: How many Drams in a Troy Ounce?
Answer:
One Dram equals 27.34375 Grains under the "Troy" system.
Further, there are 480 Grains in a Troy ounce.
Dividing 480 / 27.34375 yields a result of 17.554285.
Meaning that there are 17.554285 Drams per Troy Ounce, +/- 0.0000001