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Cannelure Question

Discussion in 'The Ammo & Reloading Forum' started by nevadal, Jul 28, 2012.

  1. nevadal

    nevadal New Member

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    Reloading 38 special rounds.
    Bullet: Hornady 158 GR XTP
    Case Length: 1.155
    C.O.L: 1.544
    My question is when I set up my test carteridge, (dummy round), the cannelure is approx 0.084 above the end of the case.

    The same thing when I stuff a Sierra 158 GR JHC Power Jacket

    A friend of mine who is also reloading 38 specials says that something is
    wrong because the bullet should seat to the cannelure.

    I have been paying more attention to the C.O.L
    He thinks that these are for 357, not 38 special...I thought that they were the same bullets for either.
  2. cycloneman

    cycloneman Well-Known Member

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    I load both 357, & 38 I seat to the cannelure and crimp. Done
  3. 76Highboy

    76Highboy Well-Known Member Supporting Member

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    That is what I do too.
  4. Alpo

    Alpo Well-Known Member

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    Yeah. The only time I pay any attention to OAL is when I'm trying not to make it too long, so it will fit in the magazine. If a bullet's got a cannelure, I seat it to the cannelure.
  5. mikld

    mikld Active Member

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    When reloading ammo for a revolver, disregard the OAL specs and just crimp in the crimp groove or cannalure (at least until you have a few thousand rounds under your belt). I believe there is one exception to this and (forgive me I can't remember the bullet number; in 357") and thats with a cast SWC that has 2 crimp grooves and seated long they will be too long for some cylinders.

    I think bullet designers have located the groove/cannalure knowing how much the bullet intrudes in the case and how that affects pressures, so crimping in the groove/cannalure will produce safe loads using the data supplied by the mfg.
  6. nevadal

    nevadal New Member

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    many thanks, I was under the misunderstanding that OAL was important
    because of pressures. In revolvers it doesn't matter like it does in semi's.
  7. Twicepop

    Twicepop Well-Known Member

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    Do as cycloneman and 76Highboy say to do. Put the center of the cannelure to the case mouth, and crimp, I do this as an extra step, and I get better crimp this way.


    those who beat their guns into plowshares, will plow for those who didn't
  8. gdmoody

    gdmoody Moderator Supporting Member

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    The O.A.L or Maximum O.A.L. is basically a guide as to the length that you should not go over, doesn't say a thing about not going under that maximum..
  9. ruger708

    ruger708 New Member

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    Most manuals now also list minimum OAL , as it does definately affect pressures , especially in high pressure pistol cartidges.
  10. howlnmad

    howlnmad Well-Known Member

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    He thinks that these are for 357, not 38 special...I thought that they were the same bullets for either.

    They are either. I use the XTP's in both my 38's and 357's.

    Seat to the middle of the cannelure and crimp. Just be sure that the bullet doesn't extend out of the cylinder.
  11. judgecrater

    judgecrater New Member

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    Regarding safety and pressure, never go shorter without starting at min charge and working up. The OAL is a min not a max. It is always safe to load longer. As OAL is shortened, pressure is always increased.
  12. aa1911

    aa1911 Active Member

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    Sorry to beat this horse but, if you crimp/seat to the cannulure you will be best off. Shorter will raise your pressures, not a great idea. you have a little bit of fudge room as the cannulure ring is normally fairly wide also.

    .357 and 38 use the same exact projectiles, there should be absolutely no difference in the bullets.

    OAL is a guide, just don't stray too far from it either way. Good luck!
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