358 UMT, and 416 UMT any one have info on these calibers?

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BigBore585

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So I came across the 358 UMT and and the 416 UMT and i decided i have to own one or both. But so far my nights on Google have turned up little. So i figured I would would see what the great minds on CGN's had to say about them. Any info on these calibers and rifles would be great. I havent been able to find a reamer or dies. So If You know, Please let me know.
Thanks
 
1) The 358 UMT is a 300 Ultra Mag necked up to 35 cal with no other changes.

2) The 300 Ultra Mag is based on the full length 404 Jeffrey case.

3) Bevan King was barreling up and chambering P14 Enfield, BRNO ZKK602, and single shot rifles to his 35-404 IMP more than 35 years ago. The full length 404 case is necked to 35, blown out almost straight, and has a 40 degree shoulder. He still has the reamer.

I have seen and shot the rifles, and there are still a few working in the Yukon. We used 250 gr Swift Bonded Cores at 3200 fps, and the 250 Speer spitzers at 3100. A good friend of mine killed an adrenaline-buzzed-up grizzly with his about 20 years ago. The bear had been wounded by a hunter, and was running flat out. It dropped "like a groundhog" when hit broadside in the chest.

Remington 300 Ultra Mag brass is not a strong as the RWS 404 brass we use, but have no doubt that you will easily get waaaay beyond 3000 fps with a 358 UMT.

Ted
 
i have a 35404 imp on a Sako action that we put together 28 yr. ago. I have shot all kinds of stuff with it. Awesome cartridge. Use the 250 gr. Northfork bullets. mine weighs under 7 lb. and is interesting to shoot, esp. from the bench. Carries nice. I don't have my reamers anymore, lost in a friend's divorce battle or a fire, but I do have my drawings. I think Max Clymer made those ones for me. Mark
 
I heard the Remington Ultra Mag series was the Imperial mag series ( they bought the patent ) out of Osoyoos bc, if that is the case then they had a 360 Imperial Magnum and it would be very similar to the 358 UMT you are talking about.
 
358 said:
i have a 35404 imp on a Sako action that we put together 28 yr. ago. I have shot all kinds of stuff with it. Awesome cartridge. Use the 250 gr. Northfork bullets. mine weighs under 7 lb. and is interesting to shoot, esp. from the bench. Carries nice. I don't have my reamers anymore, lost in a friend's divorce battle or a fire, but I do have my drawings. I think Max Clymer made those ones for me. Mark
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Back around that time or maybe earlier there was a chap in Regina ( Gwynn's Gunsmithing ? ) who built wildcats based on the 404 case.
 
Charlie38 said:
I heard the Remington Ultra Mag series was the Imperial mag series ( they bought the patent ) out of Osoyoos bc, if that is the case then they had a 360 Imperial Magnum and it would be very similar to the 358 UMT you are talking about.
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They are similar but the 35-404 that Bevan has the reamer for and the 30-404 that I designed and built 2 rifles for both pre-date the Imperial magnums by some years. It is my old hunting buddy that Ted alluded to in his previous post and I was there when he bought the rifle from Bevan and was there many times to witness it's effect on game, a seriously effective cartridge, with recoil approaching that of the 378 Wby. It was this cartridge that prompted me to design and build my 30-404, it worked out perfectly as Luke would form and fireform cases from 404 brass and then I would take them and neck them down to 30 cal and develop my loads. A wonderful co-operative venture. Back then I could order brass out of Huntingtons and have it in about a week or so, Bell, A-Square, and occasionally RWS if we were lucky. Luke also managed to get about 40 cases marked Parker-Hale but we had no idea who actually made them, suspect they may have been Kynoch.
Them were great days of wildcatting, scrounging for cases, load development, scrounge for more cases, search for slower powders like H570, more load development...........a lot of fun, waiting impatiently for new reamers to arrive in the mail, barrels already threaded and contoured........waiting.......the good old days, for sure.
OP, anyone with a 300 RUM reamer and a 35 and 416 neck and throater could chamber those up for you, it ain't rocket science. In a CZ magnum or 602 Brno you can get 4 under in the mag if that matters to you and you have lots of action and magazine length to play with your OALs. The Rem and Sako actions are shorter, but can be lengthened with a fair bit of work and the Mod 70 it shorter yet and considerably more work again to lengthen.
 
Another cartridge that would be close to that on a different case would be the 358 STA ( shooting times Alaskan ) its a 8mm rem mag necked up to 35cal pushes a 250gr over 3000fps.
 
There have been a few 358 magnums on the full length H&H case over the years. I played with an Ackley 40* shoulder quite a few years ago. It would get 3100, but did it at much higher pressure than a UMT will.

Ted
 
If I was tempted to try a .358 with more oomph than my Whelen, I think I'd give the .358 Nukalpiaq a try (aka: .358-375 Ruger).
 
Hey its been a while since there was any activily in this thread. But Im in the works of getting things together to build the 358 UMT. Im just wondering if anyone knows of a smith here in southern alberta (perfer calgary) that could do the barrel install for me?
 
BigBore585 said:
Hey its been a while since there was any activily in this thread. But Im in the works of getting things together to build the 358 UMT. Im just wondering if anyone knows of a smith here in southern alberta (perfer calgary) that could do the barrel install for me?
Click to expand...

Normally I would recommend ATRS however if you're just looking to get the barrel chambered and spun on #### Pietsch might be a better choice, if he's still around and plumbing guns.
 
BigUglyMan said:
8mm Rem Mag necked down to 35. Very capable but a bit of a flop. Really should have been in .366" to make more sense.
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Thanks BUM. Necked up to 35. There would be a little extra push to that compared to the 358 Norma Magnum I made mention of. In .366, that could be the second generation, ;)the .366 Wagner Magnum.
 
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