17 Mach IV case forming

Discussion in 'Small Stuff--22s, 20s, and 17s' started by SenderoMan, Sep 23, 2017.

  1. SenderoMan

    SenderoMan Silver $$ Contributor

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    Quick question. Can I neck down a 221 Fireball case down to 17 Mach IV in one pass?
    I have 221 Fireball RCBS FLS die, figured I would run them thru it and than thru a 17 Mach IV FLS die.
    Okay, I realize that is two passes, but let me know experiences.

    Thanks!
     
  2. dsandfort

    dsandfort Silver $$ Contributor

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    Pretty big reduction for one pass. I'd worry about collapsing the necks. I take mine to 20 cal using a VarTarg form die then go th 17 from there. I've also used the Bullberry double ended form die. 20 on one end, flip it over and 17 on the other.
     
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  3. SenderoMan

    SenderoMan Silver $$ Contributor

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    I agree, it is a pretty big step and I'll look into those form dies. Just checking to see what people have done, thanks for your input!
     
  4. Mike Casselton

    Mike Casselton

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    Dec 5, 2014
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    I used the seating die with the stem removed to do the first pass. Imperial wax was used to lube them.
    The full length die was used as a second pass. No lost cases.
     
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  5. tonyb

    tonyb Silver $$ Contributor

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    Mark, I would use a .20 Vartarg sizing die for the first operation.

    Tony.
     
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