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Thread: Question on dies

  1. #1
    Toyoda
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    Question on dies


    A have 2 sets of RCBS 7 mag and 270 dies that have different numbers on the tops of the dies. I can't find what the difference is, need some help.
    On the 7mag I have a FL/seat 70 and a FL/seat 73.
    On the 270 I have a FL/seat 66 and a FL/seat 87. The 87 is a small base.

    What does that mean?

  2. #2
    Basic Member darkker's Avatar
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    Small base does almost exactly what the name says. So those dies resize your brass to a smaller base set of dimensions. So if company A normally sizes things a bit large, you may need a smaller set of specs to be able to resize certain brass that wad fired from a generous chamber. Most commonly at this point, it is vogue to use them in AR pattern rifles.
    I'm a firm believer in the theory that if it bleeds, I can kill it.

  3. #3
    Toyoda
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    Can you point me to a list that tells me what the #'s mean? I searched but can't find (I'm sure its out there)

  4. #4
    Basic Member bootsmcguire's Avatar
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    I asked this same basic question about the numbers on the top of the dies as I bought some dies that had different numbers and I am not an RCBS expert as I normally use Lee or Redding. The guys here told me that RCBS stamps the last 2 digits of the year it was made on the top of the die.
    204, 22 K-Hornet, 222, 223, 22-250, 22-250AI, 6BR, 243, 243AI, 6-06, 6-WSM, 250-3000AI, 270, 7-08, 7RM, 30BR, 308, 30-06, 375 H&H, 444 Marlin, 450BM, 458WM

  5. #5
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    Quote Originally Posted by Toyoda View Post
    A have 2 sets of RCBS 7 mag and 270 dies that have different numbers on the tops of the dies. I can't find what the difference is, need some help.
    On the 7mag I have a FL/seat 70 and a FL/seat 73.
    On the 270 I have a FL/seat 66 and a FL/seat 87. The 87 is a small base.

    What does that mean?
    The two digit number is the year of manufacture, "70" 1970, "73" 1973 etc.

    Bill
    Each morning eat a live green toad, it will be the worst thing you'll have face all day.

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