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

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Old 05-30-2011, 10:55 AM
Junior Member
Join Date: Aug 2009
Posts: 23
Can 7 Rem Mag brass be necked up to 358 Norma?

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.

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Old 05-30-2011, 04:05 PM
Platinum Member
Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: Can 7 Rem Mag brass be necked up to 358 Norma?

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.
Predictions are difficult, especially when they involve the future
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Old 05-31-2011, 07:18 AM
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Join Date: Feb 2002
Location: Rapid City, South dakota
Posts: 410
Re: Can 7 Rem Mag brass be necked up to 358 Norma?

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.
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Old 05-31-2011, 09:10 PM
Silver Member
Join Date: Jul 2005
Location: Juneau, Alaska
Posts: 213
Re: Can 7 Rem Mag brass be necked up to 358 Norma?

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.

"Fenced yards ain't hole cards and like as not never will be, reason for rhymers and old five and dimers like me."
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