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As far as I'm aware it's std .224, the only difference I know is the neck on the case is a tad thicker.
There is another one similar but I think is .228 diameter. It has a very similar name.
I'd go with the 5.6x57R then, but then my next rifle is 7x65R so I am a bit biased towards different cartridges.
What rifle is it going in? A Ruger No1?
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