Imperializt Russia wrote:The two aren't hugely comparable, I'm afraid.
Because of the low total ammunition and low ammunition weight, you might get away with spring feed or something, but I'm not certain.
Hmm. Beyond Tue basic layout I suspect your right. The idea in any case, is to have an ammunition drum wherein the ammunition is placed radially with the projectiles pointing towards the center. Assuming I've not buggered the measurements, a 150 round drum would be roughly 9x6cm, which really is fairly small all told.
The only issue with such a design is that the rounds, sitting radially with their noses down, are not in a particularly handy position for feeding. My idea was to have the cartridge grabbed and rotated by a set of arms attached to the bolt carrier group. The operation would, in theory be fairly simple, relying only on a pivot point and an additional reciprocating piece.