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7MM WSM brass problems

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  #1  
Unread 01-10-2009, 09:30 PM
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7MM WSM brass problems

I own a winchester M70 coyote in 7mm wsm.
The problem I'm having is with winchester brass after the second firing
I can almost seat the bullets by hand even if I anneal the brass.
Has anyone else had this problem. Thanks
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  •   #2  
    Unread 01-10-2009, 09:33 PM
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    Re: 7MM WSM brass problems

    Has it been doing it from the get go or just all of a sudden.

    Did you try measuring your expander ball?


    Brent
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    Last edited by blipelt; 01-10-2009 at 09:47 PM. Reason: more info
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      #3  
    Unread 01-10-2009, 09:51 PM
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    Re: 7MM WSM brass problems

    In the past I havent shot it enough through it to tell. I usually shoot one or two rounds before deer season and maybe one or two during season. Going that way it takes awile to go through 50 pcs of brass. Now that I started shooting longer ranges I'm going through brass faster thats when I noticed the problem.
    The expander ball dont touch the neck vary much, I could pull brass past it by hand. Thanks

    Last edited by john_m44; 01-10-2009 at 09:56 PM.
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      #4  
    Unread 01-10-2009, 10:07 PM
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    Re: 7MM WSM brass problems

    What kind of dies are you using?
    I outside neck turn my brass,just a lite clean up, in most cases only take material off 50% of the neck.My outside neck measurement is .311 It sounds like your having problems with your sizing die.
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      #5  
    Unread 01-10-2009, 10:37 PM
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    Re: 7MM WSM brass problems

    Have you tried sizing without the expander ball?
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      #6  
    Unread 01-11-2009, 12:01 AM
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    Re: 7MM WSM brass problems

    The dies are RCBS they were probably one of the first sets, I had to wait a couple of months to get them.

    Here are some measurements that I took.

    expander ball .2832
    outside of neck before sizing .3218
    after sizing w/o ex. ball .3115
    after sizing w/ ex ball .3120
    neck of a loaded round .3130
    actual bullet dia. .2838

    I don't know if these measurments help. Thanks
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      #7  
    Unread 01-11-2009, 09:27 AM
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    Re: 7MM WSM brass problems

    you actually have a good situation. just run the brass in the sizer without the expander. this will give you straighter brass and looks to me about a .002 squeeze on the bullet. i don't use an expander on any of my cartridges.

    my only other advice i would give is to avoid RCBS dies.
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