Found most of these cartridges years ago but really have not been able to add anymore variations. The Mark1 either black powder or cordite is about impossibe and very expensive as well as the Indian Dum Dum Arsenal headstamp
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I got my collection of .303 a long time ago for almost nothing . An importer was selling 50 lb boxes of .303 made up from loose round picked up from Interarms old warehouse in England . I got a very large selection of about everything from 1900's - to 1950's .