@Chilli_Dog
Brave project, doing something everyone says can't be done! (-:
Maybe... keep your double stack magazine, but make it SINGLE FEED (like a sten gun magazine). Easier to get to work overall, and with single feed lips you can then have the top cartridge riding considerably higher, giving it a better chance to chamber. You could even design the magazine with the feed lips slanted upwards at a few degrees, for that extra chance of chambering, which will also help further to avoid rimlock, as per a standard .303 magazine. Anyway, with single feed magazine lips you would not encounter much rimlock.
Single feed magazine lips do not accommodate stripper clip loading however. )-:
To illustrate Sterling SMG mag with double feed lips on the left, Sten magazine with single feed lips on the right:
Another note on how to make a good follower. As I recall, PA Luty advises to use a longtitudinally sectioned cartridge as the ideal shape to construct your magazine follower. If you go with the double stack + single feed idea, place the half cartridge centrally on the follower to enable it to support the final cartridge as it is held by the magazine lips. It will then also function as a bolt stop on an empty magazine, an improvement on the Lee Enfield!
Good luck!
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