“I don’t know if the Gatling gun would work right with FMJ rounds.”
Wiki
The standard ammunition mixture for antiarmor use is a five-to-one mix of PGU-14/B armor-piercing incendiary, with a projectile weight around 14.0 oz (395 g or 6,096 gr) and PGU-13/B high-explosive incendiary] rounds, with a projectile weight around 13.3 oz (378 g or 5,833 gr).[10] The PGU-14/B’s projectile incorporates a lightweight aluminum body, cast around a smaller caliber depleted uranium penetrating core.[11] In 1979, the Avenger was tested against M47 Patton tanks and caused “severe damage”.[12]
An innovation in the design of the GAU-8/A ammunition is the use of aluminum alloy cases in place of the traditional steel or brass.[13] This alone adds 30% to ammunition capacity for a given weight. The projectiles incorporate a plastic driving band to improve barrel life. The cartridges measure 11.4 in (290 mm) in length and weigh 1.53 lb (0.69 kg) or more.
Cool. Thanks