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Pro auto Disk problem

Discussion in 'Reloading' started by tcoz, Apr 19, 2014.

  1. tcoz

    tcoz

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    Jul 4, 2013
    This one really has me stumped. I've been loading 4.2gr of Bullseye in my 9mm rounds using a Lee Classic Turret press and the Pro Auto Disk powder measure. The .49 disk consistently drops 4.2gr, once in a while dropping 4.3gr, but not often. So far I've probably loaded 1200 rounds without a problem. All of a sudden tonight in the middle of a reloading session, it started dropping 3.9-4.0gr and then after about fifteen of those, it started dropping 3.6gr consistently, not 3.7 or 3.8, but 3.6 every single time. I took everything apart and cleaned it, then tried the .53 disk. It was also consistently dropping loads about 1.3gr lighter than usual. Everything appears to line up correctly so right now, I'm at a standstill. If anyone can shed some light on this, I would greatly appreciate it. Thanks.
     
  2. WeeWilly

    WeeWilly

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    Nov 12, 2011
    Idaho
    Things that come to mind (now in order of likelihood, at least to my mind):

    Scale, verify with check weights.

    Check to make sure the hopper is all the way open. The pro model turns to close, it can turn during the operation of the turret, slowly closing.

    Stroke, make sure the disk is sliding all the way forward and back.

    Something in the hopper (spent primer, bullet, case) I have heard each of those.

    Clean the drop tube portion (all the metal parts that powder runs through) with something like alcohol or acetone, don't let the more volatile solvents touch any of the plastic.

    That's all that comes to mind right now.

    BTW, on my load records, .49 cavity dropped 4.5gr of Bullseye, but it has been a long time since I used one.

    Good luck.
     
    Last edited: Apr 19, 2014

  3. WiskyT

    WiskyT Malcontent

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    Jun 12, 2002
    North Carolina
    All of that and especially the giant red part.

    Something aint right.
     
  4. Colorado4Wheel

    Colorado4Wheel

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    Nov 2, 2006
    CO
    Check the tube, , make sure it's not partway closed (in the off postion) check and be sure the die is down far enough to fully activate the disc. All this has been said but it's something in that area.
     
  5. Aquagear

    Aquagear

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    Aug 29, 2010
    Sparks Nv.
    What he said:

    I have been using the Lee disk measures for over 15 years without a hitch. The only time I have had any problem was something interfering with the linkage, which did not allow it to make a full cycle. They are fairly fool proof, you must have missed something.
     
  6. G-34

    G-34

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    Oct 20, 2012
    North Dakota
    same problem here!! i have found that bullseye powder likes to stick to itself and not really fall freely sometimes unless there is enough weight of powder in the container to make it fall....


    i dont know how to explain it any other way, i just make sure its topped off and problem goes away until it gets low again and i see it starts dropping light charges and fill it up and so forth:wavey:
     
  7. WiskyT

    WiskyT Malcontent

    11,682
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    Jun 12, 2002
    North Carolina
    I've been running Bullseye through my autodisc since 1985 and never had the OP's problem. I often run the hopper down until it's almost empty and never had the OP's problem.

    Bullseye meters beautifully in most measures including the autodisc. With the OP's problem, and anyone else having the same or similar issue, there is some type of mechanical problem at hand. Failure to trace out the mechanical problem and write it off as "normal" can lead to a hazardous condition. The OP's use of the 0.49cc cavity at some point WILL throw 4.5 grains. When it does, that 12.5% increase could cause a case blow-out or worse.
     
  8. FiremanMike

    FiremanMike Way too busy

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    The interwebs
    My powder drops never matched their supposed correlating cavity.
     
  9. Aquagear

    Aquagear

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    Aug 29, 2010
    Sparks Nv.
    Mine have all thrown slightly under by a tenth or so. I think Lee dose that purposely for safety reasons. Better a hare under than over, No matter how unsafe it is someone out there will try to use the measure without scale checking it.
     
  10. WiskyT

    WiskyT Malcontent

    11,682
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    Jun 12, 2002
    North Carolina
    True, and 0.49 is listed at 4.6 while 4.5 is what I get, it is always consistent. The OP is getting much less than that and it's inconsistent.
     
  11. tcoz

    tcoz

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    Jul 4, 2013
    I've been getting 4.2gr consistently through about 2000 rounds and the inconsistent light drops just started. I always weigh every fifth charge, but right now I'm weighing EVERY charge.
     
  12. F106 Fan

    F106 Fan

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    Oct 19, 2011
    As mentioned above: What kind of scale? Are you verifying the scale with check weights?

    Richard
     
  13. tcoz

    tcoz

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    Jul 4, 2013
    Digital scale with new batteries and verified with check weights and beam scale. 3.6-3.8gr drops were visually lighter than 4.2gr so it isn't a scale problem.
     
  14. Colorado4Wheel

    Colorado4Wheel

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    So did you double check everything as we advised?
     
  15. tcoz

    tcoz

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    Jul 4, 2013
    I did. I also took the powder system and powder through die completely apart, cleaned everything and reassembled. Now it's back to dropping 4.2gr nine out of ten and 4.3gr the other time. Don't know what it was, but it seems to be back on track. I'll continue to weigh each charge for a bit just to be sure. I want to thank everybody for your help.
     
  16. Colorado4Wheel

    Colorado4Wheel

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    CO
    4.2 to 4.3 is normal for a powder to vary just a little.
     
  17. WiskyT

    WiskyT Malcontent

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    Jun 12, 2002
    North Carolina
    It's still too light for that cavity. Maybe Lee has made the cavities smaller? IDK, but I do know that I have been buying and using Bullseye in my Lee autodisc for 30 years and it always throws 4.5 with the 4.9cc cavity which has been verified on two different beam scales.
     
  18. Colorado4Wheel

    Colorado4Wheel

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    Nov 2, 2006
    CO
    That is interesting. If your is he none pro maybe there is a difference. I don't know why. I should try some Unique in mine and see what it throws.
     
  19. WiskyT

    WiskyT Malcontent

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    Jun 12, 2002
    North Carolina
    I have two. One is a pro and the other is not. They both throw the same.
     
  20. unclebob

    unclebob

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    Mary Esther FL
    They both should throw the same. They both use the same disk. And that is what determines how much it throws. Sense it is a fixed disk and unless you do something different from throw to throw they should be the same. Of course you will have a very slight variation from time to time.