CONSISTENT OAL?

Discussion in 'The Ammo & Reloading Forum' started by mgatc, Jan 15, 2011.

  1. mgatc

    mgatc New Member

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    Any suggestions for getting more consistent OAL?

    I feel like I am getting too much variation on either of my presses. Last nights goal was an OAL of XX.320. The actuals ranged from XX.313 to XX.327 with the average being XX.319.

    RCBS 2 die rifle. No micrometer. Bullets are Sierra Match Kings.

    Is this too much variation and if so, How can I minimize it?

    Thnx,
    m
    Last edited: Jan 15, 2011
  2. zkovach

    zkovach Active Member

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    i dont have an answer but i typically see about .006 in variation myself and never had a problem with my loads.
  3. steve4102

    steve4102 Former Guest

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    Measure from the Ogive, not the tip of the bullet.
  4. mgatc

    mgatc New Member

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    Where can I find the tool that measures from the Ogive?
  5. steve4102

    steve4102 Former Guest

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    Go to Midway, Sinclair and others and look for "Bullet Comparator".
  6. rocklinskier

    rocklinskier New Member

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    This thread is interesting to me. I posted a very similar post a few weeks ago. Somewhat new to rifle reloading, I was concerned with the varied COAL. So....do you just trust your seating die, pick a best medium for the desired COAL, and trust that the Ogive length is consistant?

    If you have the bullet comparator, will it show inconsistant lengths?, Theoretically,, The seat plug should contact the bullet at the same point time after time correct?
  7. noylj

    noylj Member

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    1) It just doesn't matter. If you wonder, try shooting them. Sort them and shoot them. Cut off some tips and shoot them.
    2) You can try "dead-length" bullet seating but, if your press is mounted solid and the press and bench don't flex and your dies are tight and shell plate is tight and your bullet ogives are consistent, what more could you do?
    3) What is your accuracy goal and what can you really expect from your rifle?
  8. dksac2

    dksac2 New Member

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    The Ojive on quality bullets, especially match bullets wil be far more consistant than cheap FMJ bullets.
    It is the best way to measure if looking for consistancy.


    John K
  9. 312shooter

    312shooter Active Member

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    mgatc,

    The Ogive is where it counts in the bullets you are dealing with, it is where most seater plugs mate to apply pressure to the bullet during the seating process, and its also the forward most portion of the bullet that will introduce, via the slope, engagement to the lands but not to be confused with the bearing surface which is rearward of the ogive. The pic may help you visualize whats happening inside you seater die, note the 3/8 of an inch of the bullet tip inside the plug, From the ogive foward to the tip is where inconsistency is found in bullets, very little in SMK's but you still find them, even more so in lower quality bullets. This is a Redding seater and a 135gr SMK in .270

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    Last edited: Jan 20, 2011
  10. mgatc

    mgatc New Member

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    Nice picture "312".

    I had asssumed the seating die worked by pushing on the end of the bullet and not the ogive. Still have to get the device that allows measuring the OAL via the ogive and not the tip.

    Is that the Redding match seating die that runs about ~$100.00?

    m
  11. 312shooter

    312shooter Active Member

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    NO this is the standard series A seating die
    Last edited: Jan 20, 2011
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