For an easy space gun cartridge to shoot XC. Take the 22Nosler case and run an expander mandrel in it to make it a 6mm? There are a bunch of 6mm cartridges similar, but they take quite a bit to form. My thought is to take the 22 Nosler case and just open the neck to take a 6mm bullet for an XC space gun. Throat it to allow the 107+/- bullets to properly seat for 600 and shoot the 87s at the short lines.
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