How much does a single round from the GAU-8 Avenger gatling gun weigh?

Answer 1

Depends on which round you are asking about. The Armor Piercing Incendiary PGU-14/B has a projectile weight of about 14.0 oz (395 grams or 6,096 grains) and High Explosive Incendiary PGU-13/B has a projectile weight of about 13.3 oz (378 grams or 5,833 grains).

Answer 2

There are two types of rounds for the gau 8.

(1)High explosive Incendiary

(2)Armor piercing Incendiary

If you're talking about the whole round (containing the cartridge casing and the projectile) then for the high explosive incendiary, each round weighs "690 grams" (projectile weight:378 grams) and for the armor piercing incendiary, each round weighs 720 grams(projectile weight:395 grams)

Not only by the Gau 8 avenger of a10 warthog, these rounds are also used by the gau 23/a cannon of Ac 130 gunship.