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Per your request ..Google is a beautiful thing..
I can stop by later and mow the yard for you as well if you wish..

https://www.youtube.com/watch?v=UTBOoGj5oFU&t=177s

http://www.thefirearmblog.com/blog/2017/...e-calibers-025/

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Yes I went looking after reading Mr Hack Waffle, writer of the year.

I did find out, it was based on the 6.8MM SPC, which strangely enough is rimless but somehow based on the .30 Remington Rimmed case ... now I do know the rim can be turned off a rimmed case for backshedders to make a case for reloading, but saying a rimless factory case is from a rimmed case??? No.

Loosely based maybe, but not originating from it.

It is also apparent the .224 Valkyrie uses a .308 bolt head to function in an AR. Haven't compared its dimensions to the .good old 7x57mm case head size to see how different they are.

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Although Federal has not released its spec sheet yet, the .224 Valkyrie appears to have a case that is about 1.62″ long, with an 0.240″ long neck. The shoulder is almost certainly 30 degrees (as is popular at the moment), and the case taper is probably similar to .308 at about 0.35 degrees per side. Since I already had a 6.8 SPC case model laying around, this made modeling the .224 Valkyrie in SolidWorks pretty straightforward:

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Mmmm, I wonder if it isn't actually just a .308 shortened and necked down. Or would be very similar. ie forget the rimmed .30 Remington.

Still no ballistics chart. Not released yet. So my guess is all these writers are relying on factory PR ballistics. For their fancy pancy charts proving superiority.

Given my sarcasm and cynicism, i actually like the idea of it, as I liked the idea of a 5.6x57. Except that one had a bad reputation for thick and solid neck. And lack of suitable heavy bullets at the time.