10 February 2002, 05:45
<Lee in OH>Forming the 17 Mach IV....
Has anyone tried to form using .222 Remington brass rather than .221 FB????
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11 February 2002, 23:42
<JDD>you need form dies to take the 222 down to 221 then 221 down to MK4, then you may need to neck turn, I would bet you will need to then also find your chamber lenght and trim the brass
lot of time
JD