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When to size 300 wsm brass

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  #1  
Unread 08-31-2013, 01:50 PM
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Join Date: Jan 2010
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When to size 300 wsm brass

I measured the new Winchester brass and it is .005 under factory spec for max length. After I resize before I shoot he first time and after I resize after the first shot, I am over what the books show for max length. The case are only over about .002. These are mild loads and will still chamber fine. Do you guys go by the letter of the law or just trim when they won't load in the gun? Thanks
  •   #2  
    Unread 08-31-2013, 05:11 PM
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    Re: When to size 300 wsm brass

    oops, not very highly recommended to trim after they won't chamber because,

    Just before that they will expand during firing, come up against the end of the chamber and squeeze the bullet as it exits the case mouth greatly increasing pressure.

    been there and done that. Not good.

    Thus I would highly recommend following the "letter of the law"

    One way to check is that a fired case should allow a bullet to drop into the mouth with no friction at all. If it won't drop in, you should have trimmed long ago.

    Always think in safe direction.
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      #3  
    Unread 08-31-2013, 05:39 PM
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    Re: When to size 300 wsm brass

    Forget books.
    Pick up a Sinclair chamber length gage: Sinclair Chamber Length Gage | Sinclair Intl
    and find out max trim length.
      #4  
    Unread 09-02-2013, 06:43 PM
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    Re: When to size 300 wsm brass

    Quote:
    Originally Posted by royinidaho View Post
    oops, not very highly recommended to trim after they won't chamber because,

    Just before that they will expand during firing, come up against the end of the chamber and squeeze the bullet as it exits the case mouth greatly increasing pressure.

    been there and done that. Not good.

    Thus I would highly recommend following the "letter of the law"

    One way to check is that a fired case should allow a bullet to drop into the mouth with no friction at all. If it won't drop in, you should have trimmed long ago.

    Always think in safe direction.
    Roy, It depends on the chamber neck spec. In my new 6-284, which has a relatively tight neck, about .004 total clearnace - .002 clearance from loaded neck to neck chamber all around, the brass springs back to the point where I can barely manually push the bullet back into the neck of the fired case.
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      #5  
    Unread 09-02-2013, 08:34 PM
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    Join Date: Dec 2011
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    Re: When to size 300 wsm brass

    Guess Roy and I are old school, I keep 'em trimmed too. Don't want the fire coming out the holes on the sides of the receiver......

    Of course my new trimmer makes that a snap....
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      #6  
    Unread 09-05-2013, 06:44 PM
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    Join Date: Dec 2012
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    Re: When to size 300 wsm brass

    Like Mike says, the only way to know for sure is to measure it. Why trim it if it isnt needed?
      #7  
    Unread 09-06-2013, 09:15 AM
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    Re: When to size 300 wsm brass

    Quote:
    Originally Posted by Mikecr View Post
    Forget books.
    Pick up a Sinclair chamber length gage: Sinclair Chamber Length Gage | Sinclair Intl
    and find out max trim length.
    Very dangerous to recommend to ignore reloading manuals.

    Do you load for 300WSM?

    How old are you?
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