(A dram, by the way, is 1/16th of an avoirdupois ounce
, or 27.344 grains.) To avoid confusing these shooters, ammo makers rated the velocity of smokeless shotshells in drams-equivalent.
At 480 grains, a troy ounce is somewhat heavier than a common avoirdupois ounce
, which weighs in at 437.5 grains (a grain is defined as 0.06479891 grams).
One troy ounce is equal to 1.09711 avoirdupois ounce
, those widely used to measure weights in the US and UK.
Strangely, while there is a unique weight for precious metal in the troy ounce, as opposed to the avoirdupois ounce
, there is none for wine.
Gold in the Depository consists of bars about the size of ordinary building bricks that weigh about 27.5 pounds each (about 400 troy ounces (one troy ounce equals about 1.1 avoirdupois ounces