necking up brass?

Discussion in 'Reloading' started by diderr, Apr 25, 2008.

  1. diderr

    diderr Well-Known Member

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    O.K. so here is the deal. It's time to get new brass for the ol' 300 WSM, and I can't find 300 WSM Norma brass anywhere. I found 270 WSM in stock, so would I be O.K. just necking up the 270 WSM brass? are they the same case dimensions?
    Thanks,
     
  2. Varminator 911

    Varminator 911 Well-Known Member

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    Yes the same

    According to the drawings in Nosler #6, the critical dememsions are the same. 1.664 inches to shoulder, 2.100 overall, and 0.538 diameter at the shoulder. The 7 mm WSM is 1.702 to shoulder for safety reasons...so it won't chamber in either of the other two.
     

  3. diderr

    diderr Well-Known Member

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    so I can just neck up a 270 wsm, and it will work perfectly?
     
  4. Varminator 911

    Varminator 911 Well-Known Member

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    Should work

    You should be able to neck the 270 WSM up to 308 and the body/ headspacing should be OK. Necking up may change overall lenght and neck wall thickness. I haven't done it so cann't tell you everything will be OK. You need to check. Both cases too long and necks too thick can be dangerous.

    I'd bet if you trim them to length after necking up they will be fine. But don't bet your eyesight on my guess.
     
  5. BountyHunter

    BountyHunter Writers Guild

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  6. wildcat

    wildcat Well-Known Member

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    Check with Cabellas, Natchez, Midway USA and Sinclair.

    W.
     
  7. diderr

    diderr Well-Known Member

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  8. diderr

    diderr Well-Known Member

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    o.k i just placed an order for 100 300 wsm for sinclair. I figured out if I budgeted my money till next pay period i'll be o.k. I'm not going to lie, due to how long my bag of 50 lasted a bag of 100 will last me till the end of the year. I was looking on Midway, and it will be late August till they get more in stock!!