I apologise for not being clear in my post - I imagined a different system, not a spring system.i once test this concept for drum magazine. the long curve path took a heavy toll on a spring. halfway through, the spring aren't strong enough to push the round reliably. an extra strong spring may cause a problem when feeding the bullet into the magazine. furthermore, the strong spring may cause the bullets to "jump" out of magazine.
I really need to draw what I'm imagining. It wouldn't be perfect, but I thought it might have potential. What I'm thinking is also a neat way to dispense with the spent cartridges too, and would allow for reasonably safe and easy loading.
I'll need to get back to you on this. (but I am willing to bet pennies that someone has already thought of it, and probably has a patent; and the reason it isn't in common use is because it probably doesn't work!)
EDIT TO ADD:
I just found a drum-magazine patent that outlines the distinct disadvantages of some drum-type arrangements. I can see related issues I hadn't thought of, an although they specifically refer to magazines that feed upwards into a column, there are significant issues that I'd need to look at in-depth. Still, they aren't showstopping items, but it'd require a complicated engineering solution to begin with. Lots of prototypes would need to be designed and tested to fine tune it, as it isn't a simple device.
Seeing that the whole idea of magazines is that they are cheap, simple and have few moving parts, I'm putting this one in the 'too hard basket' as it were.
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