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Will virgin brass cause more pressure?

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  #1  
Unread 04-28-2010, 07:35 AM
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Will virgin brass cause more pressure?

I have a load that I use for my 7mmWSM,that I developed a year ago,I have only shot it using fired brass.My load is at max charge,according to published data,although I have no pressure signs.If I load up some of the same powder charge,but using virgin brass,will anything change as far as pressure goes?
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    Unread 04-28-2010, 07:44 AM
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    Re: Will virgin brass cause more pressure?

    Technically yes it should but it will be such an insignificant amount you wont see it. If you worked up your load to "book" max and stopped just because that is where the book stopped chances are you are quite a ways under your real max anyway. So have no fear of new brass.
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      #3  
    Unread 04-28-2010, 08:11 AM
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    Re: Will virgin brass cause more pressure?

    Quote:
    Originally Posted by Tikkamike View Post
    Technically yes it should but it will be such an insignificant amount you wont see it. If you worked up your load to "book" max and stopped just because that is where the book stopped chances are you are quite a ways under your real max anyway. So have no fear of new brass.
    Well stated!
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    Unread 04-28-2010, 08:16 AM
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    Re: Will virgin brass cause more pressure?

    I had a lot of head space on my 270 WSM and with new brass I had to fire form before max load or it would lock the bolt, the pressure was the same but the case couldn't get blown out to the side walls and get any traction before the case was shooting back and slamming into the bolt face.
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    Last edited by bigngreen; 04-28-2010 at 09:31 AM.
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      #5  
    Unread 04-28-2010, 09:16 AM
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    Re: Will virgin brass cause more pressure?

    "Will virgin brass cause more pressure? "

    No. By the time the chamber pressure reaches about 30-35k psi it all fits the chamber quite well.
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      #6  
    Unread 04-28-2010, 10:34 AM
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    Re: Will virgin brass cause more pressure?

    OK,thanks guy's.I just wanted to make sure,better safe than sorry.
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      #7  
    Unread 04-28-2010, 10:37 AM
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    Re: Will virgin brass cause more pressure?

    Quote:
    Originally Posted by Tikkamike View Post
    If you worked up your load to "book" max and stopped just because that is where the book stopped chances are you are quite a ways under your real max anyway.
    While I would tend to agree with using virgin brass and max loads I don't agree with the statement above. My Savage 7mag will show pressure signs with 3grs powder less then "The Book" max with same brass, primer, and OAL. The one size fits all doesn't apply to reloading.
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