Reloading Cannon Drums Inflight?

[Kongo-Otto]

Originally Posted by JG52Uther

I'm really not sure. I know the Beautfighter cannons were reloaded by the guy sitting in the back, but have no idea if this is correct for a 110!
sitting in the gunner position I don't think I can see any cannon.
However, wiki says this:

2 × 20 mm MG FF/M cannons (180 rpg - 3 drums with 60 rpg, cannon were reloaded by rear gunner or radio operator during flight)

Yes the BF 110 Canons where reloaded by the rear gunner/radio operator: