Generally they don't. Lighter bullets generally have a worse ballistic coefficient as compared to heavier bullets of the same caliber.
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Many things can be smaller than a rock, such as a pebble, a grain of sand, or even a speck of dust.
It depends on how thick the Kevlar vest is.
A grain of salt does not equal 1 milligram; rather, it is approximately 58 milligrams. This discrepancy arises from the historical use of the grain as a unit of measurement in the apothecaries' system, where 1 grain is defined as 1/7000th of a pound. In contrast, the metric system defines 1 milligram as 1/1000th of a gram. Therefore, a grain of salt is significantly larger than 1 milligram.
An avoirdupois ounce is equal to 437.5 grains, while an international troy ounce is equal to 480 grains. It is based upon the mass of a single grain of cereal.