The 3 1/2-inch load in 000 is less common, but you can expect eight pellets of 000 in a 2 3/4-inch shell and 10 in a 3-inch shell. Buckshot can one-shot limbs and kill other than the head.
AWG American Wire Gauge / Diameter / Resistance. Used in the United States and other countries as a standard method of denoting wire diameter. The higher the number the thinner the wire.