Douhgnut avoidance

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by 284stak, Jan 17, 2010.

  1. 284stak

    284stak Well-Known Member

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    Are there any 7mm cartridges/cases that seem less likely to form doughnuts? Have been told the Norma cases are more apt to and wildcat cartridges do as well from the necking down/up.
    Am getting close to rebarrelling and after having to deal with doughnut issues in a necked down 330-7 dakota - want to avoid this as much as possible in the future. Am leaning towards a 7WSM.
     
  2. Tang

    Tang Well-Known Member

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    Is your choice only for a short action ? If not, why not a 7 STW or 7 RUM, or the tried and true 7mm Rem Mag ?
     
  3. Mikecr

    Mikecr Well-Known Member

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    A 7WSM is a very good cartridge. It will not stretch(causing donuts) and need to be trimmed as much.
     
  4. bigngreen

    bigngreen Well-Known Member

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    Using Norma brass in my 270 WSM doughnuts show up in 3 firings, Win and Rem never a problem. My head spacing is a little long but when I tighten it up I may give Norma a try again.
     
  5. 284stak

    284stak Well-Known Member

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    A short-action is not my only option - just seems that a 160-180 vld in a 7WSM gives pretty good ballistics. I have a straight feed mag already (HS-Precision DM) that will work nicely. The 7RM would be 2nd ---- currently have no desire for the STW/RUM ---- have noticed that even if they do go faster, a lot of the vld bullets don't shoot as accurately at that higher speed.
     
  6. Gene

    Gene Well-Known Member

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    Usually, necking up causes donught formation inside at bottom of the neck. If the base of your seated bullet will not touch the doughnut, its not an issue.