Can 7 Rem Mag brass be necked up to 358 Norma?

Discussion in 'Reloading' started by gearfoot, May 30, 2011.

  1. gearfoot

    gearfoot Member

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    Aug 28, 2009
    I have close to 400 pieces of 7mm Rem Mag brass. I just picked up a 358 Norma mag and was wondering if I could neck up this brass instead of buying new stuff.

    Thanks.
     
  2. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

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    Sounds like to far to go without gaining problems somewhere along the way. I have gone 7mm remington to 308 norma and back. but 7 to 358 is going to leave some thin necks. Even with annealing I bet you will get some splitting. I have gone 7mm-300 wby to 340 wby and brought 378 wby down to 30-378 wby then turned the necks. But I have not gone 30-378 to 378. I think necking up is where the problem would be.
     

  3. BillR

    BillR Well-Known Member

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    Let me do some looking. Might take a day or so but I might have a bunch of .358 Norma brass we could do some swapping or something. I come across brass every now and then pretty cheap and I will grab it up. Thought I had maybe 100-200 rounds of brass but will have to look. Will let you know. Might save you a headache or two. :)
     
  4. Festus

    Festus Well-Known Member

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    I have a .35/284 and form brass from .284 Win. so I would say it's doable. Much easier to use .338 Win. brass tho.

    Festus