To put it plainly, slug grain is the heaviness of the shot. A "grain" (additionally generally shortened as gr) is equivalent to 1/7000th of a pound. This unit of estimation follows its starting points to artifact and should address the heaviness of a strict grain of wheat or grain. Normalized by the British in 1855, the grain is utilized to gauge shot weight, just as the heaviness of gold foil and a few drugs, in addition to other things.
