Home Forums Reloading Big Game Rifles Reloading for a Wildcat, the 375/350

Picked up the Mauser in 375/350 that NTO offered here in the classifieds. What a nice rifle! Finding some info online for loading it, one load in particular that interests me the most. Thinking of using the Speer Hot Core 235gr spitzer the most and not looking to make it anything other than what it is. I do have some 300gr TSX, just wondering if the 375/350 cartridge can push those fast enough for a TSX to work. Another member was kind enough to send me data on a 375 Whelen Improved, I'm told the 2 cartridges are very close. Interested in reading other's first hand experience with this cartridge here and thanks for your time. Dean

Don't have any info on that set up but I have used several lighter bullets in my H&H. The 235 Speer and Barnes both worked well on deer but I always wanted something with a higher BC for NA in case I had a longer range opportunity.
When Barnes came out with the 250TTSX I thought I had found the answer but could never get my rifle to shoot them into less than about 2 MOA (from a rifle that shoots everything else into sub MOA). Played around with the GMX but it didn't perform much better. I just picked up some Hornady CX and so far they look more promising although I haven't shot them for groups yet, just ladders
Good luck with yours, the 235 Speer should work out very well.

You might look at 376 Styer data ,and compare case volume for a place to start.

Should be like a 375 Whelen. Sort of like the 350 RM vs 35 Whelen. I have a 375 Whelen AI, Mauser action. I don’t hot rod that rifle, but I believe it has a little more capacity than the 375-350.

375 Whelen AI M98 235 grain Speer and 60 grains of H335 is the load I like with that rifle. The other loads I've mainly been shooting in that rifle were cast

Here's loads I got on-line for another cartridge that is a bit larger than the 375 Whelen AI and the 375-350, which is the 375 Hawk Scovil that basically has close to the body of the 9.3x62 with neck for a 375

1/10/2021 Load Data - .375 Hawk/Scovill

270 Barnes X-Bullet Hodgdon H-4895 58.0 grains 2,450 FPS
:
270 Barnes X-Bullet Winchester W-748 61.0 grains 2,515

270 Barnes XLC Hodgdon H-4895 58.0 grains 2,503

270 Barnes XLC IMR IMR-4895 58.0 grains 2,492

270 Barnes XLC Winchester W-478 61.0 grains 2,527

270 Barnes XLC Ramshot TAC 56.0 grains 2,449

300 Barnes X-Bullet Hodgdon Benchmark 52.0 grains 2,228

300 Barnes X-Bullet Hodgdon H-4895 53.0 grains 2,221

300 Barnes X-Bullet IMR IMR-4064 54.0 grains 2,236

300 Barnes X-Bullet Winchester W-748 58 grains.0 2,294

For what I intend to do with this rifle, liking the 235gr Speer more and more, it won't be for long range. Yes, the 375 Whelen Improved is a larger case and going to check out the 376 Styer to compare. If I need more 375, I have a 375 Ruger, so just looking to make the 375/350 a short/moderate range thumper. The rifle has a 20" barrel and is very well balanced, don't have a scale, but it's not a heavy rifle. Thanks for your comments and sharing your knowledge, appreciate it. Dean

Loads for the 375 Whelen AI and a 20" barrel

1/23/2021 Load Data - .375 Whelen Improved (20-inch barrel)
.375 Whelen Improved (20-inch barrel)
Warning! Notes: Although maximum loads were safe in author's rifle, they may be excessive in others. Maximum powder charges
shown should be reduced by 20 percent for starting loads in other rifles. Federal 210 primers were used in all loads. (Handloader
Issue 152)
Be Alert: Publisher cannot be responsible for errors in published load data.

Wt. Bullet Powder Manufacturer Powder Charge Velocity (FPS)
220 Hornady FP IMR IMR-4198 40.0 2,217
Remarks: OAL: 2.98 inches; accuracy at 100 yds: 1 7/8; .375 Winchester duplication
220 Hornady FP Hodgdon H-322 55.0 2,519
Remarks: OAL: 2.98 inches; accuracy at 100 yds: 5/8; too fast for this bullet
235 Speer semi-spitzer Hodgdon BL-C(2) 56.0 2,364
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 7/16; most accurate load
235 Speer semi-spitzer Hodgdon H-335 61.0 2,604
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 1; great balls of fire
235 Speer semi-spitzer IMR IMR-4895 59.0 2,587
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 1; long range deer load
235 Speer semi-spitzer IMR IMR-4895 63.0 2,720
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 1 7/8
235 Speer semi-spitzer IMR IMR-4895 65.0 2,772
Remarks: OAL: 3.228 inches; accuracy at 100 yds; 1 3/4: max. pressure
235 Speer semi-spitzer IMR IMR-4320 65.0 2,726
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 1 1/2
235 Speer semi-spitzer IMR IMR-4320 67.0 2,805
Remarks: OAL: 3.228 inches; accuracy at 100 yds: 1 5/16; max. pressure
267 Lyman 375167 PB IMR IMR-3031 36.0 1,601
Remarks: OAL: 3.08 inches; accuracy at 50 yds: 1 3/8
270 Hornady roundnose IMR IMR-4895 59.0 2,461
Remarks: OAL: 3.273 inches; accuracy at 100 yds: 5/8
270 Hornady roundnose IMR IMR-4895 60.0 2,495
Remarks: OAL: 3.273 inches; accuracy at 100 yds: 1 1/16; brush buster
270 Hornady roundnose IMR IMR-4895 61.0 2,576
Remarks: OAL: 3.273 inches; accuracy at 100 yds: 1 1/4; max. pressure
270 Hornady roundnose IMR IMR-4320 62.0 2,519

Thank you Bugger.

Found the load that I'm liking and most likely going to use for this rifle/cartridges intended purpose. Load involves Speer 235gr bullets and IMR4064 powder. Now, I just need to shore up the amount of 350 Rem Mag brass that I have to make the cartridge.

When I bought my first 350 Mag I made brass from 7 Mag cases until I could find factory made cases.