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bad crimp cause

Discussion in 'Shooting Related Threads' started by Blueraven81, Sep 5, 2010.

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  1. Blueraven81

    Blueraven81 TS Member

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    Look at the pics below; what causes this and are the shells safe to shoot?

    I'm using a MEC 9000 18.4 gr, Clays, 1 1/8oz, Remington Gun Clubs, AA Wads, 209 primers.

    About 1% of my reloads crimp like this.

    Thanks,
    Craig
    [​IMG]

    [​IMG]
     
  2. Ahab

    Ahab Well-Known Member

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    Make sure that your crimp starter is loose enough to rotate freely, then crank that handle a little more slowly.

    Yes they are safe to shoot ... but toss them after you shoot them. They will always crimp like that after being crushed like that.
     
  3. WYBOO WOOD

    WYBOO WOOD Member

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    I was getting a severe swirl in my crimps from my MEC 600 JR. on most any brand of hull I was loading. Tried all of MEC's solutions but nothing solved the problem. The crimp starter was properly installed and rotated freely. I tried one day to make a shallower first crimp by not pulling the handle all the way down and a miracle occured. Perfect crimps on any hull. I adjusted the crimp starter UP all the way and replaced the factory nuts (1/4x20 thread) with thicker nuts which allowed clearance below the bracket to get an open end wrench on the nut and along with the top nut tighten securly. The starter is free to move and my crimps are perfect on both STS and FEDERAL hulls. Apparently the initial crimp was too severe an angle.

    Would the Power Skiver available from Ballistic Products be capable of reconditioning the hull in the thread above or is there too much "memory" in the hull mouth? I am considering purchasing one to reshape the ends of my "swirled" hulls. Dave Hunt
     
  4. Blueraven81

    Blueraven81 TS Member

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    Well I just got back from shooting my supply of shells distorted like the above pictures. I had about 30 of them from reloading over the past two years.

    All of them shot and I scored a 19 from 16 yds and 18 from 24 yds so apparently there were 13 that didn't shoot straight :)

    Craig
     
  5. grntitan

    grntitan Well-Known Member

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    I hate when i get those crooked shooting shells.
     
  6. Bernie K

    Bernie K Member

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    All those guys are wrong. It has nothing to do with the shells shooting crooked. This is due to a loose nut behind the trigger. BK
     
  7. Craig12

    Craig12 TS Member

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    1% is only 1 out of a 100! I do not think that is anything to worry about.
    Most likly a bad hull to start with.
     
  8. Blueraven81

    Blueraven81 TS Member

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    I agree 1% is not bad and seeing that 90% of all my reloads are shot by my Sons who shoot for the High School trap team, I inspect every single shell and toss the questionable ones in the "my shells" bin.

    Since I started reloading two years ago, I don't know how many thousands of rounds I've loaded, but I've only had one misfire and when I cut it up, there were no signs of any issues. Even the primer was dented.

    I just always wondered what could cause the bad crimp, as well as if they were safe to shoot.

    Thanks for all the responses,

    Craig
     
  9. BunkerGuy

    BunkerGuy TS Member

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    From the picture of the single shell, the problem is likely caused by the pre-fold crimper's grooves not lining up properly with the hull's crimp folds. It doesn't appear to be an excessive component length problem. Just confirm that the pre-fold is very free to spin.

    If the 1% reject rate is an issue, line up the pre-fold's groves with the hull's crimp fold lines each time before crimping (I assume the MEC pre-fold has external ridges as the Hornady 366's does).

    There's a website article (link above)that talks a little about this problem.

    - - Bill
     
  10. gdbabin

    gdbabin TS Member

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    1% out of 100 is WAY too many.



    Guy Babin
     
  11. ivanhoe

    ivanhoe Well-Known Member

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    Have you made any changes lately? I ask because it Almost looks like the crimp was started with a 6 point starter instead of an 8 point starter. Just a thought.

    Bob Lawless
     
  12. The Rock

    The Rock Active Member

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    Or the crimp starter on the machine is free turning so it catches the old folds in the factory crimp. The crimp starter on the machine just did not rotate and catch the old crimp folds. It happens. Whether it was the shell or the starter crimp????

    It just looks like the starter did not follow the old crimp and tried to create a new bunch of pleats. The old ones didn't like it much.

    Rock

    Jim
     
  13. philk

    philk Member

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    I get almost an identical one sometimes from my PW useing old AA hulls.
     
  14. BigM-Perazzi

    BigM-Perazzi Well-Known Member

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    or the crimp starter has broken petals... Most 8 petal hulls will crimp with the plain, no petal crimp starter.
     
  15. OldGoat

    OldGoat Well-Known Member

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    It may be that the shell (hull) itself is a little taller (longer) than others. I have read somewhere that Remington STS or Nitro hulls (which I prefer and use exclusively) as well as Federal and Winchester hulls have a slight variance in length...not many, but maybe the suspect 1 out of 100. I have seen the same crummy crimps from time-to-time (about 1 in 100 to 200) and I suspect the longer hull is the culprit. I just shoot the mis-shapen crimped shell and pitch it. Best Regards, Ed
     
  16. TC

    TC TS Member

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    Sometimes you will get a hull with a smooth portion instead of a nice 8 point opening. What has happened is that the plastic has gotten too hot in that area. These hulls will never crimp right and look very similar to the one pictured. Tony
     
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