I know the chinese chokonu but everyone knows these sort of "crossbows" were weak and not intended for long range shooting, they were defensive weapons with poison bolts.
The fast recocking systems I know:
Lever action (with push or pull systems
For the mags I Only know the stacks (top feds and bottom feds with spring) and revolver type.
Are they hard to conceive and is there other type of magazine system that are workable and even better a magazine that can keep the fletching in a good state like in the revolver type as the one I saw had rotating ramps which was an ingenious system.
What's your thoughts what's the ideas that can come up and I will show a 3d model soon about what I'm doing about a system I conceived myself but the 3D model wouldn't be full mechanized it will have most of the mechanism and yeah that's all about it.
And PS: sorry if my english is terrible