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.
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