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.338/300 Ultra Case Forming

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  #1  
Unread 01-30-2005, 07:56 AM
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.338/300 Ultra Case Forming

I'm about to purchase some brass, I want to know if it would be better to go with .300 RUM brass and size up the necks or get .375 RUM brass and reduce the necks? [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img] I believe both cases are same L.O.A. Just don't know which the pros/cons of each..
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  •   #2  
    Unread 01-30-2005, 08:30 AM
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    Re: .338/300 Ultra Case Forming

    You can go either way if you want a tight neck in a factory spec chamber cut use the 375 and turn the necks. If you want simplicity use the 300 and simply run it in a die. I understand Federal has brass available for the handloader now, although I don't know where to get it.
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      #3  
    Unread 01-30-2005, 08:46 AM
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    Re: .338/300 Ultra Case Forming

    Well this is going to in a Pac-Nor super match chamber. You were right about the Federal Brass but only in .300RUM. I was thinking of getting some of the Federal because I'm hearing the Rem isn't that good. But I don't know if by sizing up I would be creating thinner necks. But if I went with .375RUM I could neck turn them down.
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      #4  
    Unread 01-30-2005, 11:14 AM
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    Re: .338/300 Ultra Case Forming

    I have been sizing up the 300 case with great success for a long time now.
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      #5  
    Unread 01-31-2005, 02:41 AM
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    Re: .338/300 Ultra Case Forming

    Shawn Would you care to share any load data. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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      #6  
    Unread 01-31-2005, 09:24 PM
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    Re: .338/300 Ultra Case Forming

    Necking the 300 up is the easiest and works great for me too!You are going to love this round!!!
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      #7  
    Unread 02-01-2005, 10:51 AM
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    Re: .338/300 Ultra Case Forming

    I have used H1000 with the most consistant success. RL25 and Retumbo work well I understand.

    300 GR SMK
    OAL 3.775"
    .020" OFF LANDS
    CCI LR MAG PRIMERS
    REM BRASS
    H-1000 start @ 90.0 gr my final load will run somewhere between 92.0 to 96.0 gr. depending on chamber throat length etc.

    This should put you in the 2900 + fps range.

    I have built 14 of them and they will shoot 2900-3000 depending on each rifle all with 30" tubes. Good luck and hope you enjoy it.
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