Remington 222 MAG

You might have some success in re-sizing 204 ruger brass in a 222 mag die. IIRC, the 204 is based on the 222 mag, just 'improved' & necked down. So all you need to do is neck up, set the shoulder back, and taper the body.

Just make sure you lube up real good before you stick it in ;)
 
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