While my favorite caliber is the 375 H&H, and the 458 Lott is the 375 case just blown out, has there been a cartridge developed or worked with by taking a full length 375 H&H case and necking it down to either 358 or 9.3?

wasn't the 35 Newton essentially a 375 necked down? or the 350 G&H?

358 STA, 9,3 sisk

The 358 Shooting Times Alaskan (358 STA) is a full length H&H case necked to 35 caliber with the shoulder moved forward and the body blown out to minimal taper. Very easy to fireform from 375 H&H brass and it is a SAAMI cartridge. It's quite a performer.

Edited to add: Just a bit slow on the draw I guess.

Gee...I always thought original 358STA cases were developed from 8mmRem mag brass. Which is ofcourse made from 375................


Squatch

While the 358 STA can be made from 8mm Rem Mag brass, and was developed when the 8mm was somewhat more popular than it is now; it does NOT share shoulder and body dimensions with the 8mm. It is not just the 8mm Rem Mag simply necked up to 35. The shoulder angle is 10 degrees steeper, the shoulder diameter is .015" larger and the neck length has been adjusted. It's all in the SAAMI drawings.

I think you can look at the entire belted magnum line of cartridges and find .375 H&H heritage. Of course, the .460 Weatherby stuff was "designed" by belting the .416 Rigby, probably because "magnums" were supposed to be belted.. but that's just a marketing ploy, IMHO.)

Even the .458 down to the .264 Win Mag (albeit, shortened) come from the original. Heck, I once couldn't find .350 Remington Mag brass and made some from .375 H&H... I forgot about the 6.5 Rem Mag. One of those in a Model 600 was a real deer killer with 120 grain bullets!

I have shot a couple of .358 STA's for several years, it is an awesome round. Originally designed by Layne Simpson as the perfect Brown Bear round with a 250 grain in excess of 3000 fps. Kenny Jarrett built the first rifle for Simpson using a "Lilja" barrel, they combined their expertise for the project. Art Alpin of A-Square legitemized the round with SAAME requirements and arranged for the Winchester Custom Shop to produce 58 Stainless rifles that were outstanding in looks and performance. I managed to get my grubby hands on one of those rifles (you would not beleave the red walnut stock quality), plus I found another custom with thumbhole stock and "Lilja" barrel. They are both shooters that my son and I have taken on many Elk hunts, as well as trips to Alaska, Alberta and the Selous as my plains game rifle. Combined with North Fork bullets in 225, 250 and 270 grains and loads that will push the larger bullet in the 3000 fps range with accuracy, it is extremely limitless in uses. I started with 8mm brass and fireformed, now I can get brass from several sources headstamped correctly that require no fireforming. I still find my most accurate loads are from once fired brass. .375 brass can certainly be used if desired. Just my .02's worth to the discussion. Good shooting.