Very close
30TC perhaps? The clue about the link with Creedmoor led me to this.
Far out it looks like a .308 Win dimensionally.
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17 hornet ?
The .30 T.C is actually the parent case for 6.5 Creedmoor for all you haters… 
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222 rimmed?
Not a 17 hornet, not a 222 rimmed however that is closer than the 17 hornet guess.
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If you would like another pic comparing it to another cartridge then sing out.
Is it made from a Savage parent case?
No Sir it isn’t. It is however a wildcat.
219 Donald duck wasp?
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Yep, 219 Donaldson Wasp. I honestly thought it might take a little longer to figure that one out. Well done.
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Ha, I thought he made that name up
I made up the Donald Duck, stupid phone auto corrected so I just ran with it. Lol.
Try this one out guys…
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Looks like a necked down 45/70…Is it a coal 2.6?
Smaller
Is it a Rimfire?
Yes mate.