I found four of these .303 British with knurled lead bullets. Based on the lack of mold marks and the knurled groove on the bullet, and the marked out headstamp on two of them, I suspect they are legitimate factory or arsenal guard loads, but I am unable to locate any information on them. Also. the headstamp on the third cartridge has me stumped. The 9 (or 6) and the C are clear, but what is the third character. I assume it is Canadian, as are the opthers, but who produced this headstamp?