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Can anyone shed a light on this? Date of the ban? Duration? Extent, coverage in the Empire? Thanks.

But certainly if the ban was only, at least, parts of the empire, including India, it would reduce the volume of such cartridge rifles being made. And the number of vintage rifles today.

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The 303 was banned in NSW for a time. Hand loaders would cut a 1 MM or so off the case, have the chamber shortened and called it 7.7X what ever it was. Some police would see if they could chamber a 303 round in the rifle, if they could you got charged.

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303
This will explain things a bit better than I can!

I thought you'd be all over this one mate!
https://milsurpafterhours.com/bb/viewtopic.php?t=793