300 win mag and 300 Rem Ultra Mag

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by c east, Jun 26, 2003.

  1. c east

    c east Well-Known Member

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    Jan 2, 2002
    Do they use the same shell holder?
     
  2. Guest

    Guest Guest

    I believe the RUM take a RCBS 4 3 But you may be able to get away with the one you use for the 300win. Not sure!
     
  3. sakofan

    sakofan Well-Known Member

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    528
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    Apr 17, 2003
    RCBS #4...300WM
    RCBS #38...300RUM
    They look basically identical.
    I used them interchangeably, with no problems...sakofan..
     
  4. JustC

    JustC Well-Known Member

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    453
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    Sep 25, 2002
    my #4 wouldn't take my RUM cases without putting a lot of presure on the case to force it in. RCBS told me that they have encountered different dia rims,..so they recommend the #38 to fit them all.