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case head separation

24fan24fan Member Posts: 209 ✭✭✭
edited December 2008 in Perry Shooter Competition Shooting and Reloading Forum
This 30-06 is loaded with a 165gn. nosler ballistic tip,
56gn. IMR 4350 (1gn. below nosler max), Remington brass. Brass is trimed to lenght with OAL of 3.34
The fired brass is from the same rifle. Is this a pressure or head space problem?
[img][/img]DSCF0028-1.jpg
[img][/img]DSCF0032.jpg
[img][/img]DSCF0029-1.jpg
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    Tailgunner1954Tailgunner1954 Member Posts: 7,734 ✭✭
    edited November -1
    It's a headspace problem, kinda.
    The HS on the rifle is most likely within specifications (distance between bolt face and the datum ring on the shoulder of the CHAMBER).
    What your seeing is symptomatic of a reloader that's pushing the shoulder of the CASE back to far during the re-sizing step.
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    dcs shootersdcs shooters Member Posts: 10,969
    edited November -1
    It looks like a weak piece of brass, looking at it from the end. I've seen load data going up to 60gr. IMR 4350 with the 165gr. bullets.
    How many pieces have done this? How hard did it come out of the chamber?
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    OdawgpOdawgp Member Posts: 5,380 ✭✭
    edited November -1
    quote:Originally posted by Tailgunner1954
    IWhat your seeing is symptomatic of a reloader that's pushing the shoulder of the CASE back to far during the re-sizing step.


    +100
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    mrbrucemrbruce Member Posts: 3,374
    edited November -1
    Adjust your sizing die for your chamber and it will not likely happen again........
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    CryptoChiefCryptoChief Member Posts: 100 ✭✭
    edited November -1
    How many times has this brass been loaded? Repeated sizing and firing has a tendancy to weaken the brass in that particular area as does hot loads. If you start seeing a "ring" on the brass in that area chances are you will experience case head sep in very short order. If you see the ring, toss the case(s) and start with some new stuff. As mentioned in an earlier response by mrbruce, resize cases fired in your rifle to your guns chamber. I resize all my cases to there the shoulder is bumped but not pushed back thereby eliminating all but the smallest of case expansion/stretching.

    CC
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    jonkjonk Member Posts: 10,121
    edited November -1
    It's in your reloading. Very simple fix. Assuming you are using a bolt action, soot the neck of the brass and slowly lower your sizing die until it is sizing the neck but not touching the shoulder.

    Should fix the problem.
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    mrbrucemrbruce Member Posts: 3,374
    edited November -1
    You really need to be pushing the shoulder back at least .0015, that a thousandths and a half, or you''ll be finding them hard to chamber after a time or 2 fired...
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