The standard unit of weight of the U. S., is the pound, Troy weight, the table of which is:
| 24 grains, | 1 pennyweight; |
| 20 pennyweights, | 1 ounce; |
| 12 ounces, | 1 pound. |
The grain, ounce, or pound, Troy, and the grain, ounce, and pound, Apothecaries’ weight, are precisely the same; but the ounce is differently divided.
The grain weight is the same in both tables. The pound Avoirdupois, like the pound Troy, contains 7,000 grains. The pound Apothecaries, contains 5,760 grains.
One pound of powder, Avoirdupois weight, will load 140 fifty-grain cartridges; 93 seventy-five-grain cartridges; 70 one-hundred-grain cartridges.
A dram Avoirdupois is equal to 27¹¹⁄₃₂ grains.
In weighing bullets and powder in grains, Troy weight is used, and 437½ grains are equal to one ounce Avoirdupois. The drachm, Dixon measure, is 27½ grains, Troy or Apothecaries’ weight.