284 Win Chamber help

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by jbpmidas, Mar 14, 2019.

  1. jbpmidas

    jbpmidas MR F-T/r

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    Reamer is marked 284 Win from PTG. Fired brass measures .4905 at shoulder and .500 at base. My sizer sizes back to .4745.

    I’m thinking the reamer is mismarked, but I can’t find what chamber it actually is.

    Any help is appreciated!
     
  2. Zero333

    Zero333 Silver $$ Contributor

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    Only thing you can do right now is take the sizing die and 3 pieces of fired brass and send it to Whidden gunworks or Hornady or wherever and they'll hone it proper.
     
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  3. Steve Blair

    Steve Blair

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    It is likely a .284 Shehane reamer. I'm not at home or I would post my reamer print.
     
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  4. jbpmidas

    jbpmidas MR F-T/r

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    The Shehane prints I found were .4845.
     
  5. Steve Blair

    Steve Blair

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    They are usually Ø.485" but it would not surprise to see a chamber with .010" total body taper (Ø.490").
     
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  6. jbpmidas

    jbpmidas MR F-T/r

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    Would that little body taper cause extraction issues?
     
  7. Steve Blair

    Steve Blair

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    Shouldn't in a bolt gun. The case contracts ~.001" after firing.
     
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  8. Steve Blair

    Steve Blair

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    Here's my Shehane reamer, Ø.485.
     

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  9. jbpmidas

    jbpmidas MR F-T/r

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    Sounds like a Shehane sizer would work my brass less.
     
  10. Steve Blair

    Steve Blair

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    It would, but since you have a non-standard chamber, even for a Shehane, Zero333's suggestion is the best course. John Widden makes fine dies and you'll have one that fits your cases well.
     
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  11. jbpmidas

    jbpmidas MR F-T/r

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    I have several sets of his dies. I’ll do some more testing before I decide to send the die back to him. Thanks for the help!
     

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