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

[gearfoot]

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.

 

[Long Time Long Ranger]

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.

 

[BillR]

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.

 

[Festus]

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