Advice

nicholasjohn

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Feb 12, 2019
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Vancouver, WA
The 8mm Remington may have the same dimensions in the body of the case, and just a different neck diameter. I've read on this forum about guys sending dies to Forster to have the necks "honed" to a slightly larger diameter. If they make a die for the 8mm magnum cartridge, maybe they could open up the neck enough to size the 358 for you. If somebody makes a bushing die for the 8mm, switching out the bushing might be the trick. There's also a 375 Weatherby, which is an improved 375 H & H. ( It's a very old design, and is not based on the huge Weatherby case.) It may have the rounded shoulder, and may not work. There's a book by a guy named Howell that shows a ton of cartridge dimensions, and something in there may match up with what you need. If you find one there, it may appear on some die maker's wildcat cartridge list. You could then use that to size the bodies, and the necks could be handled in a separate operation by the Hornady universal neck die mentioned by Idaho Hunter. Lastly, if you can find a die for the 358 Norma Magnum, that just might work. It will be short, but there's a collet die available that sizes the lower body of any belted magnum case. That would be tricky, but might get you by if you can't find a better way to go. Best of luck - I'm really interested in seeing ow this works out for you.
 

demonjigger

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Mar 28, 2017
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50
I was going to suggest, that if you need fired cases to have a custom size die made, I have just sized a little bit of the neck by tapping a bushing on a 1/8th of an inch and pulled it off. Just enough to hold a bullet for firing. Do this until brass has 3 firings and send it in. I usually do 3 pieces of brass to send.
 
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Equalizer

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Sep 19, 2019
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Gods country
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Equalizer

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Sep 19, 2019
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Gods country
Thanks for all the responses and ideas. I truly appreciate it.

I spoke with Redding about 9 months ago and they currently (at that time anyway) we’re only taking orders from their vendors.

I had a two die set ordered through midway but yesterday I got a back order cancellation email. It would seem Redding isn’t making any soon. But I’ll call em back. I’m determined to get this up and running!
 

jdyoung

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Mar 1, 2020
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Ironman Country
I don't know anything about this cartridge , 358 Shooting Times Alaskan !! BUT , from a search, I found out that the parent case is the 8mm Remington Magnum.
http://www.broadswordgroup.com/358_sta_.html
At the above link, a brief history is given as well as a fireforming recipe loaded rounds. Also mentioned is that A-Square was the first to produce loaded ammo for this cartridge.
 
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jdyoung

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Ironman Country
I just searched for A-Square .358 STA.
This link came up.

It's from a guy that makes custom ammo. It is listed as sold but maybe you could contact him , see if he can help. That COULD get you started. And after shooting, provide the three rounds needed for a die maker to construct dies.
 
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wv270wsm

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May 10, 2016
Messages
787
Simple solution I’ll take it off your hands . Lol man I’d love to have one of those . When I was in middle school I remember opening up and gazing at my dads nosler load manual , anything stw caught my eye . I’ve got a 7 mm stw looking to add a 257 and I’d like to find a 358 also . They’re just super cool in my itty bitty mind
Also there is a small shop here locally that may have some factory loaded ammo if you’d be interested I can check just pm me and I can see if so we’d work something out
 
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