@Towely
The Saiga mag is to prevent rimlock occurring. The original specification for the .303 cartridge has a 45deg chamfer at the rear edge of the rims to avoid this problem. However, much .303 ammo does not have this rim chamfer, simply because the SMLE magazine is designed to avoid rimlock - by tilting the rear end of cartridges increasingly downwards as they go down in the magazine, almost as if sliding back off the magazine follower -- hence the rear-down shape of the SMLE magazine. Bloke On The Range has an interesting YouTube video on Rim Jam, why it is not a problem. Saying that, I have put a lot of cases through the lathe to do a quick chamfer.
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