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How to prevent primer 'pull back' ?

Discussion in 'Reloading' started by ManNamedJed, Jan 25, 2010.


  1. ManNamedJed

    ManNamedJed
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    I recently started loading .40. I have a bunch of range pickup brass as the local cops use our IPSC range. A good portion of it is nickel SPEER.

    I'm having a high number of instances where during sizing/depriming, the primer is pulled back into the case. I can usually feel it on the primer seating stage, and pull it out, but a few sneak through. I always get a little freaked out when I find a round with a spent primer when I run them through the case gage - hafta wonder if it means I created a squib.

    Lately I've been getting 4-5 per hundred rounds. Does anyone have any ways to prevent this? It seems to happen most with the nickeled Speer (which seem to have kinda loose pockets, as the new primers go in really easy). I think I've had maybe 3 in the last 10,000 rounds of 9mm.

    I load with a dillon 650 BTW.

    Thanks!
     

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  2. bfoosh006

    bfoosh006
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    Make sure your de-priming stem doesn't have a burr on it, if it does polish (lightly) it smooth with some emery cloth. And there is a fair chance that you need to adjust the die to fully push out the primer, if it is only pushing it out "1/2" the way, it may be causing this Problem. You should be able to see the de-priming stem "poking"out of the bottom of the case (by an 1/8" ) on a correctly de-primed one.
     

  3. shotgunred

    shotgunred
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    reloading nut

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    your depriming pin needs adjustment.
     
  4. ManNamedJed

    ManNamedJed
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    The pin extends at least 1/2" past the base of the die. It is 'bottomed out' - so it can't get any longer. I felt the tip and it seems smooth. Perhaps I'll put in a new decapping pin just to check.
     
    #4 ManNamedJed, Jan 25, 2010
    Last edited: Jan 25, 2010
  5. WiskyT

    WiskyT
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    I know the press is blue and therefore not prone to problems, but apparently Dillion has QC issues as well. My father had the same problem with his 650 ten years ago. They still haven't gotten it right. My Pro 1000 never did this.

    Now that the gratuitis cheap shotting is out of the way, I'll tell you what Dillon told my father. Chuck the decapping pin in a drill and dress down the edge of the tip so the edges aren't so square. Just a little bit will do it.
     
  6. Colorado4Wheel

    Colorado4Wheel
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    What kind of Die are you using? Like was stated before it's likely a burr on your die. Clean the Die, polish the tip. If it's one of those fancy dies with the floating pin check to make sure that is still working right.

    Lee has just about the best decapper around. Simple, cheap, strong, Moves out of the way when you get a Berdan case in there, not prone to problems. If it's a Lee consider buying another pin and just being done with it.
    \

    It has nothing at all to do with the press.
     
    #6 Colorado4Wheel, Jan 25, 2010
    Last edited: Jan 25, 2010
  7. ManNamedJed

    ManNamedJed
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    Its a Dillon die BTW.

    I doubt its any kind of press problem. I reloaded tens of thousands of rounds of 9mm and .223 and this only became a problem recently when I started loading .40. Again it is almost always a nickle speer case.

    I'll try another pin and see what happens. Someone on brianenos recommended filing the tip at a slight angle so the primer gets pushed out at an angle. I'll try that too.
     
  8. unclebob

    unclebob
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    The trouble in doing that is you make a point and that pierces the primer. Just take a couple of stokes with a file or replace the decaping pin. This is not a Dillon, Lee, Redding, Hornady or any other die manufacture QC problem. They all could do it do it. More than likely you well not be able too feel it.
     
  9. dudel

    dudel
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  10. BigDog[RE]

    BigDog[RE]
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    I have exactly the same problem with SPEER nickel plated cases in 9MM. Rather than file the decapping pin or replace it, I just culled the Speer nickel cases and the problem went away. It only happened with the Speer nickel cases.
     
  11. WiskyT

    WiskyT
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    But it does have to do with Dillon. I said it was cheap shotting, and it was. But this is a known Dillon problem. It is easily fixed, and I wouldn't say Dillon gear is no good because this stuff happens. I will say that Dillon isn't as perfect as some Lee bashers would have us believe.
     
  12. JerryO

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    I have seen this occur many times over the years, but didn't know what caused it.

    I even had been haveing it occur in my single stage press. There, an occational case would refuse to slide out of the shell holder after deprimeing. I would stroke the ram again and every thing would be fine. And I thought for years that I wasn't getting the old primer out far enough.

    Since then I found that some of my cases had primer pockets that were shaped oddly and would result in this.

    A possible fix is to resize & deprime on the single stage press. The resizeing lessens the work that needs to be done by the progressive, also.

    Or discard the cases that cause the problem.


    JerryO
     
  13. Colorado4Wheel

    Colorado4Wheel
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    If the new decapping pin fails you get a Lee Sizing die. I have never had this happen with my Lee Sizing die.
     
  14. Colorado4Wheel

    Colorado4Wheel
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  15. unclebob

    unclebob
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    I have.
     
  16. ChaneyD

    ChaneyD
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    I have both 650 & 550 and never had this problem and I load 11 different calibers. With this said, I would go after the depriming pin and change it out and see if that makes the difference.
     
  17. unclebob

    unclebob
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    From the Dillon 650 instruction manual.
    Decap pin not decaping.
    1. Sizing die not screwed down far enough.
    2. Decapping assembly not screwed down all the way.
    3. Decapping pin bent, broken or missing.
    4. Point of decap pin is squared off not rounded (pin gets stuck in anvil and pulls primer back into primer pocket).
    5. Berdan primed brass.
    a. Berdan primed brass has two flash holes and should not be reloaded.
     
  18. Glock2008

    Glock2008
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    Nope, just a dummy round. a squib would be a primed cartridge with to little or no powder.
     
  19. BigDog[RE]

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    ummm no. Like I said above, I had an almost identical problem, and I am using Lee dies on my 550.
     
  20. Colorado4Wheel

    Colorado4Wheel
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    I guess I am just lucky (sound of me knocking on wood). None of my Lee dies have ever done it. .38/357/10mm/9mm. It doesn't seem for all the complication (dillon and others with floating pins) that anyone has really solved the issue either.