The Accurate Reloading Forums
358 Norma M blown out to 375
02 February 2010, 12:40
gryphon1358 Norma M blown out to 375
Is there such a thing today or from yesterday,many thanks for any news.
Any figures for say 300 grains of pill?
Posts: 87 | Location: Victoria Australia | Registered: 07 September 2002
02 February 2010, 16:07
jeffeosso375 chatfield taylor . 300gr at 2500 ... and with the 375 ruger, its a waste of time
02 February 2010, 17:55
DeweyThe correct term is ".375 Durham Magnum" and I agree, this and the .338-375 or "Chatfield-Taylor" are now even more superfluous than they were before the .375 Ruger was introduced.
02 February 2010, 18:31
ramrod340Since a 308Norma case only gains a couple grs of capacity over the 30-338 I would assume a 375-358Norma would gain the same amount over the 375Chatfield/Taylor. That puts both of them about 10grs smaller than the 375Ruger.
Can a 375-358 be done sure. I'd call the velocity maybe closer to 2575-2600 fps. The 375Ruger would be far cheaper in the long run. Hornady calls factory 300s as 2660 fps from a 24".
As usual just my $.02
Paul K
02 February 2010, 20:49
StonecreekYes, the .375-338 (which is essentially identical to a ".375/.358 Norma Magnum", case capacity being negligibly different) works well if your magazine length is limited. It is a fraction shorter than the .375 Ruger and the magazine, without alteration, will hold and feed one more of the .375-338 than of the slightly fatter Ruger round. So, for certain actions, it is a viable choice. It will run about 100 fps behind the Ruger and perhaps 50 fps behind the H&H if loaded to the same pressures.
If building one, use any chamber template you choose -- it will be a wildcat, after all. Brass is most economically made from .338 Win for any version you might choose.
02 February 2010, 22:44
gryphon1quote:
Originally posted by Stonecreek:
Yes, the .375-338 (which is essentially identical to a ".375/.358 Norma Magnum", case capacity being negligibly different) works well if your magazine length is limited. It is a fraction shorter than the .375 Ruger and the magazine, without alteration, will hold and feed one more of the .375-338 than of the slightly fatter Ruger round. So, for certain actions, it is a viable choice. It will run about 100 fps behind the Ruger and perhaps 50 fps behind the H&H if loaded to the same pressures.
If building one, use any chamber template you choose -- it will be a wildcat, after all. Brass is most economically made from .338 Win for any version you might choose.
Thank you Stonecreek,there are some positives in your reply with the magazine capacity etc.
Now what about the 'other' way around in necking 375 (H+H ) down to 35 caliber? I am aware of the 35 STA but not sure of the platform its built on,but a H+H case would send a 35 missile burning IMO.
Posts: 87 | Location: Victoria Australia | Registered: 07 September 2002
02 February 2010, 22:54
ramrod340quote:
I am aware of the 35 STA but not sure of the platform its built on,but a H+H case would send a 35 missile burning IMO.
A 358STA is a 358-8mm mag with a slight shoulder change. nDue to reduced body taper the STA would have more capacity than a 358-375H&H. OAL is 3.6" so long mag box is required.
I sold the STA I had and bought a 358Norma. Other than recoil I gave up very little. My 24" STA accurate load was 2767 with a 250. My 19.75" Norma gives me 2700 with factory 250s.
As usual just my $.02
Paul K
02 February 2010, 23:22
gryphon1I have the 358 NM being built,but am exploring another build 'down the track' I am rather interested in the 35 calibre
Posts: 87 | Location: Victoria Australia | Registered: 07 September 2002
02 February 2010, 23:29
ramrod340If I had a 358N I sure wouldn't build a STA. But if I did I would not do it with less than a 26". I found that a lot of the hype for the STA went hand in hand with the STW. Very hard to reach the published velocities that Simpson first published.
As usual just my $.02
Paul K
02 February 2010, 23:42
DeweyThe .375H&H WAS necked down and a proprietary cartridge produced many years ago, this was the .350 Griffin and Howe, which was a forerunner of the .358 STA, original long Ackley and so on.
I would prefer a Ruger case necked to .358, aka the old .35 Newton to any of these.
03 February 2010, 01:18
ramrod340quote:
I would prefer a Ruger case necked to .358, aka the old .35 Newton to any of these.
After being given a 30 Newton case I can see why it has a following. Would have made a lot more sense than the various 264-338wmag syle belted magnum.
As usual just my $.02
Paul K
03 February 2010, 01:23
Stonecreekquote:
Now what about the 'other' way around in necking 375 (H+H ) down to 35 caliber? I am aware of the 35 STA but not sure of the platform its built on,but a H+H case would send a 35 missile burning IMO.
The .35 G&H, as it was known, has just a bit more powder capacity than the .358 Norma, but of course it requires a 3.65" magazine. Some shooters would laud its advantage as the slick feeding of the tapered, sloping shouldered case. I think, however, that a better variety of bullets for large game is available in the .375" caliber than in the .358" caliber, so I'm not sure what is to be gained over a stock .375 H&H.