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OAL safety question: 9mm FMJ recipe

Discussion in 'Reloading' started by Kwesi, Oct 29, 2012.

  1. Kwesi

    Kwesi

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    I have a load that I've worked up & chrono'd as follows:

    9mm PD FMJ - 115 gr
    Power Pistol - 6.1 gr
    Win SPP
    OAL 1.130 - 1.140 ( My goal was 1.135 and due to component variables these end up in the range).

    I've been using these loads for some time and have worked well. I've been loading lots of rounds and this morning noticed that the OAL has fallen to somewhere between 1.120 - 1.129.

    Should I have safety concerns shooting these? Would you pull all of them?

    Thanks!
     
    Last edited: Oct 29, 2012
  2. Boxerglocker

    Boxerglocker Jacks #1 Fan

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    I wouldn't have any issues with 6.1g at that OAL, obviously check for pressure signs but for reference I load 6.4g of PP at 1.150 for simulated SD loads.
     

  3. Kentguy

    Kentguy

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    Kwesi,

    This is my load data;
    Bullet - 124g RN FMJ (Precision Delta)
    Powder - Alliant - Power Pistol - 6.2g
    Powder range - 5.6g up to 6.4g (Speer)
    Burn rate -#33 (hodgdon)
    Bullet length OAL - 1.150"
    Velocity - 1,201.6 fps my 5 shot average @ 73 degrees
    Crimp - Light
    Test Gun - Glock 17 w/4.49" Barrel

    I tested with the OAL at 1.135" and just didn't like the results so I backed off to 1.150", much more controlled, accurate round for me out of my G17.

    Just my gut feeling but I wouldn't use those at that OAL, don't feel your going to blow anything up but based on my test results - I had better luck going longer than shorter with the OAL.

    Just my 2 cents
     
  4. TX Archer

    TX Archer

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  5. SCmasterblaster

    SCmasterblaster G17 carrier since 1989 Millennium Member

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    So what is the bullet weight?
     
  6. Kwesi

    Kwesi

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  7. Kwesi

    Kwesi

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    This is exactly why I posted the question given .005 - .010 lower OAL.
     
  8. Kwesi

    Kwesi

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    Boxer: 115 gr FMJ?
     
  9. RYT 2BER

    RYT 2BER

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    Glad you posted this as it brings on another question... I've had a situation of oal changing... How is it possible??? I mean the bullet seater die is set and locked in.. Therefore it can only push the bullet down "so far". How does the oal change?? :dunno:

    I'd love to get an answer to this.
     
  10. Boxerglocker

    Boxerglocker Jacks #1 Fan

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    6.3g with a 124 Speer GD at 1.150 is the recommended Alliant load, with a 115g FMJ at 1.120 I wouldn't sweat it. But what do I know...
     
  11. F106 Fan

    F106 Fan

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    The nose of the bullets may not be uniform and the way in which they contact the seater plug may differ. Pistol dies typically push against the nose of the bullet when a flat seater plug is used and push against some part of the side of the nose if a rounded seater plug is used.

    Lee will make custom seater plugs.

    For lead bullets, it is common for lube to transfer to the seater plug and this causes the rounds to get progressively shorter.

    And that's why Dillon dies are so slick. You just remove a wire clip and the seating assembly drops out for easy cleaning. When it is replaced and the clip reinstalled, the die needs no adjustment.

    Richard
     
    Last edited: Oct 29, 2012
  12. RYT 2BER

    RYT 2BER

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    Understood. This would explain why sometimes if my bullet placement isn't perfect (ever so slightly tilted) I can get differences... Quite frustrating!!
     
  13. Boxerglocker

    Boxerglocker Jacks #1 Fan

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    Being a little more generous with your flare along with lubing your brass with a touch of Hornady one shot will help with OAL consistency.
     
  14. F106 Fan

    F106 Fan

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    There are better seating dies from Redding. They're about $79 at Sinclair.

    These dies will properly align the bullet but consistent depth still requires a consistent bullet shape.

    http://www.redding-reloading.com/on...-for-handgun-a-straight-wall-rifle-cartridges

    http://www.sinclairintl.com/reloadi...tion-pistol-bullet-seater-dies-prod33529.aspx

    I have these dies in 9mm and .45 ACP. They work very well. Then again, I don't look for +- 0.001" in seating depth.

    Even when I use the rifle version, I still get a couple of thousandths variation and this is probably caused by slight differences around the meplat. The dial calipers can only measure actual length whereas the die is seating the bullet by the ogive.

    Richard
     
  15. Kwesi

    Kwesi

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    This is the seating die that I'm using.
     
  16. Boxerglocker

    Boxerglocker Jacks #1 Fan

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    [​IMG]

    I use the Lock-N-Load Comparator Set which measures off the ogive and when you adjust your dies accordingly the OALs are up to 0.004-6 +/- difference.
     
  17. Colorado4Wheel

    Colorado4Wheel

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    Be aware, fancy seating dies do not always work better with Lead Bullets. They are a little to tight because the lead bullet is larger and they build up with lube. In my experience my Lee seating die is better then the Hornady and Redding (both with the fancy in line seater sleeve). With jacketed the high fancy dies are pretty nice.
     
  18. Kwesi

    Kwesi

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    Boxer: unpacked my loading manuals and found:

    Modern Reloading 2nd edition
    115gr jacketed
    Min OAL 1.120
    Max 6.7gr PP / Start 6.2gr

    In other words you do know...thanks!
     
  19. fredj338

    fredj338

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    A 0.010" OAL diff isn't going to do much pressure wise unless you are already over pressure IME. If I were loading +P loads, off the book, then everything starts to matter.:wow:
    Sorry Kwesi, typo, that is 0.010". There would be an issue 0.100" longer for sure.
     
    Last edited: Oct 31, 2012
  20. Kwesi

    Kwesi

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    Thanks for your comment fred.