A single shell from an A-10’s 30mm GAU Avenger gatling gun sits on the tarmac in Afghanistan next to a standard 5.56mm round.
A 30mm High Explosive Incendiary round for the U.S. Air Force A-10 Thunderbolt II’s GAU-8/A ‘Avenger’ cannon stands next to a NATO 5.56mm round at Bagram Airfield, Afghanistan, June 23, 2012. 455 MXS Munitions Airmen are responsible for processing and inspecting the A-10’s specialized ammunition. (U.S. Air Force photo/Capt. Raymond Geoffroy)
To give you an idea how big the GAU-8/A is, here it is next to a VW Beetle:
And the best part being what it does to the Taliban: