.338/300 Ultra Case Forming

Discussion in 'Reloading' started by mkf350, Jan 30, 2005.

  1. mkf350

    mkf350 Well-Known Member

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    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? /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif I believe both cases are same L.O.A. Just don't know which the pros/cons of each..
     
  2. Shawn Carlock

    Shawn Carlock Sponsor

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    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.
     
  3. mkf350

    mkf350 Well-Known Member

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    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.
     
  4. Shawn Carlock

    Shawn Carlock Sponsor

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    I have been sizing up the 300 case with great success for a long time now.
     
  5. mkf350

    mkf350 Well-Known Member

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    Shawn Would you care to share any load data. /ubbthreads/images/graemlins/smile.gif
     
  6. sniper2

    sniper2 Well-Known Member

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    Necking the 300 up is the easiest and works great for me too!You are going to love this round!!!
     
  7. Shawn Carlock

    Shawn Carlock Sponsor

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    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.
     
  8. mkf350

    mkf350 Well-Known Member

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    Do any of you anneal the necks? And how is the case life?
     
  9. ricka0

    ricka0 Well-Known Member

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  10. 3sixbits

    3sixbits Well-Known Member

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    Re: Annealing

    Thanks B1g_bOre for that link on annealing. I wish I would have had that for another thread on the same subject. I purchased the Hornaday kit serval years ok and It has been great. Again thanks!
     
  11. Shawn Carlock

    Shawn Carlock Sponsor

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    Re: Annealing

    I don't anneal the necks and can the brass after 6 loads. I'm hot to get my hands on some federal brass.