To my own surprise and after having looked for so long into all sort of large cal. auto guns I came across the T13 charging device of M38 cal. .60 and M39 20mm aircraft guns (+ related predecessors with T numbers).
The somewhat unusual charger used a revolver drum (actually the related guns were revolver cannons too) which is chambered for 8 EA cal. 30 (Carbine) M6 grenade launching cartridges. I thought I show the system here as it is a quite unusual approach (from my view).