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7mmRm brass form to 300 wm brass??

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  #1  
Unread 06-01-2008, 08:03 PM
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Join Date: Nov 2005
Location: south central pa
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7mmRm brass form to 300 wm brass??

i aquired some 7mmRm loading goodies recently.i however dont have a 7mmRm.i do however have a 300wm.is it possible to run the 7mag brass through my 300wm fl die,then blow shoulder out with cream of wheat fireform method?both of these calibers headspace off the belt.headspace should not be a problem while cow fireforming.the only problem i see might be the 7mag case length and shoulder/neck juncture are roughly .100 to.150 thousandths shorter than 300wm.will this or could this make the necks of the "formed" brass short?help guide me here.i'm driving down a road i've never driven on before.jason:confused:light bulb
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  •   #2  
    Unread 06-02-2008, 05:11 PM
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    Absolutely

    Quote:
    Originally Posted by 30-06 boy View Post
    .100 to.150 thousandths shorter than 300wm.will this or could this make the necks of the "formed" brass short? jason:confused:light bulb
    ,,,,,,,,,,,,,,,,,

    Peter
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      #3  
    Unread 06-02-2008, 05:23 PM
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    Join Date: Oct 2007
    Location: Mountians of SW NC, near Asheville
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    Forming new cases and shortening a neck maybe .020" won't really make a difference. Shortening .120" on an already short neck is far too much.
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      #4  
    Unread 06-02-2008, 05:26 PM
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    30-06 boy,

    Sent you PM, but didn't get response. I have 1,000 pcs of 7mm Rem Mag brass. Would sell you some if you need it. Send me PM.
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      #5  
    Unread 06-03-2008, 07:51 PM
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    Join Date: Nov 2005
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    trueblue,sorry for not responding.i was just trying to make these 7mm mag cases usable to me.i tried what i said and the necksare way too short.lesson learned.but thanks anyway.jason
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