This article is from the Vietnam FAQ, by Brian Ross, John R. Tegtmeier, Edwin E. Moise, Frank Vaughan, John Tegtmeier with numerous contributions by others.
USAF published figures for the version of the AC-130A (just 7.62mm and
20mm) show an ammo load of 15,000 rounds of 7.62mm, and 8,000 rounds
of 20mm.
 
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