I know that Ackley did some wildcats with the 348, such as the 450 Alaskan.
I have not heard anything about a 375.
After looking at the case capacity of the 348, it would seem that a 375 might (if properly loaded) be a natural and might even get bullet velocity close to competing with the 375 Ruger and H&H.

I heared about a .375Alaskan made by McGowen. Don´t know anything about bullet velocity.


Martin

I found a mistake. The .375Alaskan (McGowen) isn´t made from the .348WCF. This must be a rimless or belted round.
But a .375-version with the .348WCF should exist.

Martin

it appears to have been done

http://www.custombrassandbullets.com/ch4d0627.html

Hello Bob:

It's not terribly popular, but we've made a number of chamber reamers for the 375/348 Win--in both standard and "improved" versions. If you'd e-mail me, I'll send representative prints for your review.

Best regards,

Dave Manson
david@mansonreamers.com

I have a drawing of one called the 375 Express, case capacity ~90gr H2O....

It uses the 348 case BUT the rim is turned off and an extraction groove cut...basically the same as todays WSM case. I did the same with a 45-70 case just for kicks. Seemed like a lot of trouble to go through in this day and age...

I decided that using a WSM case would be the better way to go, but after learnin about all the "problems" surrounding the Marlin action while I did three switch barrels, 356 W, 444 M and 458 American, I decided to forget the larger OD case.

If you have one of the leversmiths do their recutting of the receiver threads and enlarging the barrel threads or use the 450 Marlin V threaded receiver you will be OK in the pressure department, tho'.

Either using the 348 or WSM case OR the RCM case, would definitely produce a very good leveraction "Thumper".

Luck

To each his own and all of us owe a great deal of current ammunition/firearms knowledge to wildcatters, but for me I would not change a thing about the 348Win. as a hunting caliber.
Lived and hunted in Alaska for some years and that round works just fine for any game found there. Is it a sheep round, no, but they have been taken with the 348. Definitely not a long range hunting round, but no problems out near the 300yd. mark. The Win/Browning 71 and 348 are about as perfect combination I can think of for hunting whatever in North America including the big bears. The 71 does not lend itself to scoping, but to me that is not a detrement if the game is within suitable range for the receiver sight works just fine. Use a ghost ring set up on the sight and pratice a bit with the combo and you are good to go. Old school here, but kind of like the saying that "if it's not broke, don't fix it..."

MFD,
I differ on the potential for an elegant scope as an addition to a Model 71.
Here is a picture of one of my 71s with my custom designed scope base and EER scope.

http://s1131.photobucket.com/a...=RightSide600pxl.jpg

http://s1131.photobucket.com/a...t=RearView600pxl.jpg

http://s1131.photobucket.com/a...t=LeftSide600pxl.jpg

Unfortunately I am not experienced at rust blue techniques, but excluding that, I think it is a unique and practical.
P.S. I have another which will never have a scope.

What you say is true, MFD, the 348 is still an excellent cartridge and the M71 an excellent levergun...BUT...were it not for those who want to "FIX things that aren't broken" we would still be throwing rocks, scavanging and eating raw meat.

Status Quo is good and bad...it keeps things firmly grounded, but also stops innovation and progress....both highly evil in themselves.

Luck

One I've heard of is the .375 Scoville. Can't find the article, but a bear guide in Alaska used it as backup for his clients.

Bob:
James Watts expanded the .348 to both the .450 caliber and a .40 caliber--both in a standard and improved version (less taper and sharper neck) and took .411" bullets of 400 grains. I owned the first rifles Jim made in these calibers but sold them when I moved on to double rifles. Damn!! Sold the first .450 Watts, Too. Double damn.
Cal

I'm thinking the 375 Scovill was a 9.3x62 necked up to 375 and used in a Mod. 95 Win. I know Phil Shoemaker had one or used one a bit..It should be a nice bear gun.

At one time some years ago, there were a few 348 Win. around that had been rebarreled to a 348/375..I think that guy in Alaska did them. I shot one that belonged to a friend and it kicked like a mule.