What do I Have

[MikeT]

I recently received my father-in-law's old reloading equipment and supplies. Among the items were several cartridges and two sling swivels. I can not identify them. Here are several pictures of them. The cartridge brass is rimmed, 0.455" at the base, 0.404" at the shoulder, 0.335" at the neck, and 2.21" in length. One swivel is off-set. Any ideas what the cartridge and sling swivels are?

Information

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[Gator]

.303 ball. Dominion Cartridge Co?

[John Kepler]

The cartridges are Canadian .303 British, Dominion Cartridge, Mk. VII cordite loads....probably made in 1918. The swivels appear to be off an Enfield.

[John Sukey (Deceased)]

Going by the design, you have two No4 Mk1 butt swivels