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Do I need to trim unfired 7mmRemMag brass

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  #1  
Unread 01-07-2011, 08:28 PM
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Join Date: Jan 2010
Location: NC mountains
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Do I need to trim unfired 7mmRemMag brass

I am going to reload some unfired Winchester brass (7mmRemMag). My Sierra manual calls for a trim length of 2.490". My new brass measures 2.495" and this is before being sized. Is it standard for unfired brass to be a little long?
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  •   #2  
    Unread 01-07-2011, 09:01 PM
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    Join Date: Dec 2001
    Location: Potters Hill, NC
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    Re: Do I need to trim unfired 7mmRemMag brass

    It's not important if they're a little longer than the trim to length. That length is a guide to keep you safe from pressure which is caused by excessive case length. If the case gets too long it will extend past the cut chamber and into the rifling and "pinch" the bullet.
    That being said, every cartridge has a OAL. Truth is most rifle chambers are longer that this number. Sinclair makes a tool for finding your chambers true OAL.
    While it is important to not let you cases get too long, I think it's more important to have them all the same length. Consistency (in every aspect) is the key to accurate reloads. JohnnyK.
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      #3  
    Unread 01-07-2011, 09:19 PM
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    Join Date: Dec 2009
    Location: NW MT
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    Re: Do I need to trim unfired 7mmRemMag brass

    If mine where long I would trim, chamfer,neck size to get the odd dent out,maybe uniform primer pocket. Then probably good for a few shoots
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      #4  
    Unread 01-07-2011, 09:48 PM
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    Join Date: Jan 2010
    Location: NC mountains
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    Re: Do I need to trim unfired 7mmRemMag brass

    That was exactly what I planned on doing. Thanks for the reply. Saw you are in Montana. Man, I would love to visit there sometime. Would love to hunt there even more. Every picture I have ever seen from there looks like heaven.
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      #5  
    Unread 01-08-2011, 09:48 AM
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    Join Date: Oct 2007
    Location: Mountians of SW NC, near Asheville
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    Re: Do I need to trim unfired 7mmRemMag brass

    "Montana... Every picture I have ever seen from there looks like heaven."

    Drive over the southern end of that Blue Ridge Parkway thing, there's a Park down there that IS heaven! (Well, the parts that don't have hoards of tourists crawling over it like ants is.)
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      #6  
    Unread 01-08-2011, 04:01 PM
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    Join Date: Jan 2010
    Location: NC mountains
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    Re: Do I need to trim unfired 7mmRemMag brass

    Boomtube!!! Howdy howdy. Yeah, the Blue Ridge Pkwy is very pretty. I guess it's just like anything else tho, you take it for granted when it's right in front of you. My parents used to take us up there as kids just to ride and look at the mountains. I guess I just got bored with it after so long. Good to hear from you.
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