Was unveiled at Big 3 East conference last week. Based off the .30 Remington/6.8 SPC case and is necked down to .22 caliber. As a result, it has similar internal and external geometry to the .22 Nosler.
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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