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Split Case - Any Ideas?

Discussion in '10mm Reloading Forum' started by atyszka, Nov 19, 2012.

  1. atyszka

    atyszka

    69
    0
    Aug 27, 2012
    Minnesota
    Was at the range today testing some loads I'm working on and found these 2 cases early on. There were no others, but it's not that hot of a round so I'm surprised and wondering if anyone else has seen this. I wouldn't be concerned if this was the 3rd time for this brass, but they're brand new.

    New Starline brass
    Stock G20
    50F, 81% Humidity, 902 ft elevation
    165 gr GDHP
    15.6 gr AA #9
    CCI 350
    1311 avg fps
    1.255 OAL

    No other pressure signs (other than slightly flat primers which is always the case for me), case head is only .433

    Thanks
     

    Attached Files:

    Last edited: Nov 19, 2012
  2. _The_Shadow

    _The_Shadow Ret. Fireman

    4,519
    21
    Jul 23, 2007
    Southeast, LoUiSiAna
    That happens sometimes, brass may have been brittle in that area and as it stretched it split. Usually Star Line is soft and rarel splits like that, however I have seen many factory loads split their cases on the initial firing! Better case support can also help as the stock Glock chambers are loose.
    Good luck!
     


  3. Yondering

    Yondering

    564
    0
    Dec 3, 2011
    I agree with Shadow. Weird that it happened with new Starline brass, but with that load, I think you just got some bad brass. I've run into batches of Winchester and Lake City 5.56 brass that do that in factory ammo; sometimes it just happens.
     
  4. WeeWilly

    WeeWilly

    3,469
    327
    Nov 12, 2011
    PRK
    I have had an occasional split on new Starline with my G20/29 loads. I think if you are getting more than a couple in a batch of hundreds, I would contact Starline and see what they think. I think my failure rate might be like 1-2 every few thousand.
     
  5. atyszka

    atyszka

    69
    0
    Aug 27, 2012
    Minnesota
    Thanks for the insight guys. I've loaded tens of thousands of .40 and only see this on cases that I've shot 3-4 times. So I was surprised when it happened to a new case. I'll watch and if anymore pop up with mild loads I'll contact Starline. I ordered 1500 new and have shot about 700, so almost half way through the batch.
     
  6. SDGlock23

    SDGlock23 Glockoholic

    I had the same thing happen with some Top Brass I had at one time, lots of splitting going on.
     
  7. OregonG20

    OregonG20

    631
    166
    Sep 5, 2011
    Oregon
    I've had new Starline do the same to me with 155gr and 180gr XTP's. CCI300, 1.26 COAL and close to book max charges of AA #9 as well. No other signs of pressure. No problems either.
    I think it just happens with Starline brass sometimes. Hasn't stopped me from shooting or changing my loads. YMMV.
     
  8. Taterhead

    Taterhead Counting Beans

    3,595
    107
    Dec 13, 2008
    Boise, Idaho
    The charge is certainly not a mild load. It is a tad over book max, but the brass is the culprit. Sometimes they are not properly annealed from the factory. It happens. Vertical splits in the middle of the case are not terribly problematic. Horizontal ones near the head are a different story.

    A small handful out of a box of a thousand will do that in my experience.
     
  9. AstraPat

    AstraPat

    104
    4
    Mar 12, 2008
    Brass issue for sure. I would suspect the annealing process wasn't properly completed

    P
     
  10. Kwesi

    Kwesi

    1,453
    5
    Sep 23, 2006
    TX
    It happens to my 10mm Starline brass after numerous loadings. My nickel seem to last longer compared to regular brass.