It may be easier to start with .25-35 brass, that's the easy button for the .219 Zipper. The .22 High Power uses a .227 diameter bullet but I would think the dies would have the correct expander button for good neck tension. A chamber casting would let you know about the neck thickness. Sorry I can't be of more help! S&B was loading .22 HP in metric form recently (5.6x52R) but I don't know if that's still the case.
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