375 Remington Ultra Mag

What has been your results using this round on dangerous game?
I have very limited experience with round but will provided my Cape Buffalo experience. In 2011 I purchased a Zim Cape Buffalo hunt with camp across river from Kruger. I shot left handed so I had purchased two left hand 338 Ultra Mags since Remington never made a production left hand 375 ultra mag. So I built a poor boy big game rifle by sending action off to E. R. Shaw for a 26 inch barrel that was .810 at the muzzle to get the weight up. Then I glass bedded to an old (1987) Bell and Carlson stock. These stocks was there first generation which has rifle sling mounts inside rifle stock with a horizontal bar vs the steel stud also had very straight stock with large size recoil pad Then I pulled a older Leupold vx 2.5 x 8 to mount on rifle. This rig with four rounds in gun plus four rounds on stock weighted 10 pounds 14 ounces.

Loaded up Barnes 300 grain TSX with IMR 4831 with two grains less than Barnes loading data. At the range I had velocity of 2,889 fps and was shooting .5 moa three shot groups ( most accurate hunting rifle I own) so said good enough. Downside is recoil is brutal so only shot 19 rounds before going to Zim but did a lot of dry firing off stick. The recoil even when using a mag shoulder pad would give me a headache after seven shots from a bench position. Upon arrival at hunting camp shot one time to confirm zero and shot two bulls with one shot each. The Barnes performed perfectly and both bulls were down within 30 yards of shot. These two bulls acted liked a whitetail shot with a 30-06. Gun was put in back in vault upon returning home and has not been shot since.

TWB Hunter said:

What has been your results using this round on dangerous game?
I have very limited experience with round but will provided my Cape Buffalo experience. In 2011 I purchased a Zim Cape Buffalo hunt with camp across river from Kruger. I shot left handed so I had purchased two left hand 338 Ultra Mags since Remington never made a production left hand 375 ultra mag. So I built a poor boy big game rifle by sending action off to E. R. Shaw for a 26 inch barrel that was .810 at the muzzle to get the weight up. Then I glass bedded to an old (1987) Bell and Carlson stock. These stocks was there first generation which has rifle sling mounts inside rifle stock with a horizontal bar vs the steel stud also had very straight stock with large size recoil pad Then I pulled a older Leupold vx 2.5 x 8 to mount on rifle. This rig with four rounds in gun plus four rounds on stock weighted 10 pounds 14 ounces.

Loaded up Barnes 300 grain TSX with IMR 4831 with two grains less than Barnes loading data. At the range I had velocity of 2,889 fps and was shooting .5 moa three shot groups ( most accurate hunting rifle I own) so said good enough. Downside is recoil is brutal so only shot 19 rounds before going to Zim but did a lot of dry firing off stick. The recoil even when using a mag shoulder pad would give me a headache after seven shots from a bench position. Upon arrival at hunting camp shot one time to confirm zero and shot two bulls with one shot each. The Barnes performed perfectly and both bulls were down within 30 yards of shot. These two bulls acted liked a whitetail shot with a 30-06. Gun was put in back in vault upon returning home and has not been shot since.

Click to expand...

Since no one has responded I guess there are very few people hunting with a 375 Ultra Mag

Not the 3[emoji[emoji642]43]5 RUM but I do love my [emoji[emoji642]43]mm RUM.

Ballistically it would be a great DG round in the right rifle.
I have had more failures in remington 700s over the years when PG hunting and hunting stateside that I personally wouldn't hunt DG with one. My personal opinion thoughnI admit likely due to me not paying closer attention to critical areas related to the extractor. All can be solved by moving to an m16 style extractor on my bolts.

That said, the 375 RUM is devastating. It simply was not available in more acceptable DG rifles to have a large DG following and it imposes higher recoil velocity than the venerable 375 h&h which has history to support it.

I have always wanted a 375 RUM and have some supplies to get one built. I also shoot a 460 Wby and do not mind the time and practice required to wield a high recoil rifle effectively and consistently.

I used to own one of these, recoil in a M700 is pretty fierce. Mine was the 700 BDL Stainless laminate.

I built my .375 RUM in 2004 for an upcoming Zimbabwe Cape Buffalo hunt. It was a stainless Rem 700 BDL in a laminated stock.

I like to tinker and finish my own stocks, so as soon as my rifle came I ordered a semi-inleted laminated blank from Richards. As soon as I got that blank I pillar and glass bedded the action and barrel channel and floated the barrel, fitted a Limbsaver pad on it, then hand checkered the stock with my favorite 5 panel wrap around pattern.

I only shoot and hunt with handloads, so I loaded 3 3-cartridge test rounds with 300 gr Barnes TSX bullets, mounted a Leupold 2-7x40 scope on it and went to the range.

That thing kicked so bad that I didn't shoot all 9 of my test rounds, or get my scope zeroed. As soon as I got home I had a gunsmith install a KDF muzzle break on it, and that tamed the recoil enough that I was able to work up moa or better 3-shot groups with the Barnes 300 gr TSX hunting loads at 2898 fps and with Sierra 270 gr practice loads.

The next year I took it to Zimbabwe and got my Cape Buffalo and a Chobe bushbuck, then to South Africa for a common reedbuck, a Nyala, and a Zebra. When I got to Zimbabwe we checked the zero on both my 7 mm RM and my .375 RUM shooting a 100 yd target using the tailgate of my PH's truck for a rest. My PH had a big smile on his face when he brought my target back and the 2 7mm bullet holes and the 2 .375 bullet holes were less than 1" apart, and 1" above the bullseye. The photographer my PH had filming the hunt commented that I was the only hunter that they had that year who kept his head on the stock after the shots.

After that hunt I also put a mechanical recoil reducer in the butt stock of that rifle, further reducing the felt recoil of that rifle to less than the recloil of my .30-06 in a similar weight rifle.

In 2007 I took my .375 RUM back to South Africa for a strictly Plains Game hunt where I comfortably shot several animals from prone positions. My 270 gr Barnes TSX bullets that I loaded for that trip averaged 3043 fps.

My .375 RUM then sat in my safe until I took it to Alaska a few years ago for a Brown Bear hunt.

I have been considering that exact thing. I have 2 338 rums and currently searching for a 7 rum or 300 rum in left hand to build the exact same thing. Not sure I will ever get to Africa but I’ll have the gun built before then.

WyoBull said:

Not the 3[emoji[emoji642]43]5 RUM but I do love my [emoji[emoji642]43]mm RUM.

Click to expand...

Pulled rifle out of gun vault and decided to replace recoil pad as it had gotten hard. Also decided to put a one pound mercury recoil reducer in stock. With the one pound recoil reducer the tile is better balanced ; only slightly barrel heavy. Rifle weighs 11 pounds one ounce empty and 11 pounds seven ounces with four rounds in rifle. We’ll be interested to see how much this reduced recoil. I just purchased a left hand 375 HH Winchester Safari Express so I have a backup plan if recoil is too violent

The crappy synthetic stocks on the Rem 700 375H&H is brilliant. Shoots tight groups and recoil feels like a charged up 30-06. On the other hand my CZ550 in 375H&H weighing 2 lbs heavier passes the recoil to you and you know you have fired it.

Where am I going with this, well if you have the plastic Rem stock, get a Kick Ezz 1 3/8" magnum recoil pad put on and make sure the length of pull is right for you.

TWB Hunter said:

Since no one has responded I guess there are very few people hunting with a 375 Ultra Mag

Click to expand...

I own two ..375 RUM'S. The first one as I'm also left-hand was Weatherby LH action sent off to E.R.Shaw for a barrel with their muzzle brake. I had to have a gunsmith in Missouri re-chamber it as it pushed the bullets in and extra. 300" and the mag box lips adjusted so the bullets just didn't pop out. Once that was straightened out it is one of my most accurate rifles. See the buffalo picture i took him with rifle #1

2nd - .375 RUM
I had a long magazine left-hand Fierce Firearms rebarreled using a .375 FIERCE CARBON BARREL. Gun is all put together feeds well and is ready for testing. I plan on using it on
my booked 2026 Hunt.

Looked at a couple of them back in the day so to speak but just never liked the REM 700 options for this round. Now on a granite mountain action

Awesome caliber for Africa and especially for Cape Buff. Shot two in Moz and the second was on a charge real close. I use 300 TS Barnes with IMR 4831 at 96 grains. Extremely acurate. Love it and would love to find another for sale!!!

Muzzle Brake + Earplugs

The one I was around was very accurate and brutal without a brake.

AJ

One of the outfitters I work with in Alaska has a 375 RUM and he loves the effect it has on brown bears. He said it shocks them good and they don’t go far.

Gday I’m upto my 3rd 375 rum & on 5 th barrel now
1st was a rebarrelled fierce that wasn’t worth the money as had the bolt handle snap & that was lucky I wasn’t in buff country ( fierce I believe have fixed this now but don’t like current models so I passed on going that route again ) 2nd was a rebarrelled sako75 same as my current one & went back to a 12 twist recently

As for recoil it’s a pup compared to my 500 Jeffery lol

I like the 270 ish grain bullets having used 137 to 390 gr pills with a lot in between with the 260/80 ish weights giving the better results overall , it’s taken asiatic & cape with more killing efficiency than the 375 h&h observed numerous times

Yes love my rums ( have a 300 also & owned 5 of those over the years along with 1 , 7mm ) , the 375 rum is heading to moz in July & the h&h is getting left @ home again definitely nothing wrong with the h& h but it just doesn’t kill like the rum

Cheers

25 years ago I had CP Donnelly rebarrel a M70 SuperGrade (new model) from 338 Win Mag to 375 RUM. At the time it was an up & coming cartridge with plenty of ammo & cases available. Then Ruger had the 375 Ruger and along with the recoil encountered with "light" rifles enthusiasm for the RUM faded. I couldn't get cases but with research I was able to find 404 Jeff cases and read that the RUM was based on the 404 cases. After a few failures I got a 404 sized down to 375 but didn't note that the rim diameter was significantly different- Result: broke the extractor. Replaced the extractor and gave up on resizing 404 cases. The 375 RUM is a fine case but, to do over, I'd probably go with the Ruger.

Gday Rayb

Ray B said:

25 years ago I had CP Donnelly rebarrel a M70 SuperGrade (new model) from 338 Win Mag to 375 RUM. At the time it was an up & coming cartridge with plenty of ammo & cases available. Then Ruger had the 375 Ruger and along with the recoil encountered with "light" rifles enthusiasm for the RUM faded. I couldn't get cases but with research I was able to find 404 Jeff cases and read that the RUM was based on the 404 cases. After a few failures I got a 404 sized down to 375 but didn't note that the rim diameter was significantly different- Result: broke the extractor. Replaced the extractor and gave up on resizing 404 cases. The 375 RUM is a fine case but, to do over, I'd probably go with the Ruger.

Click to expand...

Nice stuff
Today is a little different from years gone by as we have @ our disposal a few brass companies that do 375 rum & companies that also do loaded ammunition for which makes the 375 rum a little more appealing today but I’d say the ruger is more popular than the rum ? but both don’t offer the variety /availability of the h&h which may be more appealing to some than others so I guess it’s what floats one’s boat as long as one is having fun it’s all cool either way

Cheers

How does a 375 RUM compare to a 378 weatherby?

The RUM has slightly less case capacity than the 378 Wby. Barrel length & max pressure being equal the difference would be about 100 fps.

Fordy said:

Gday I’m upto my 3rd 375 rum & on 5 th barrel now
1st was a rebarrelled fierce that wasn’t worth the money as had the bolt handle snap & that was lucky I wasn’t in buff country ( fierce I believe have fixed this now but don’t like current models so I passed on going that route again ) 2nd was a rebarrelled sako75 same as my current one & went back to a 12 twist recently

As for recoil it’s a pup compared to my 500 Jeffery lol

I like the 270 ish grain bullets having used 137 to 390 gr pills with a lot in between with the 260/80 ish weights giving the better results overall , it’s taken asiatic & cape with more killing efficiency than the 375 h&h observed numerous times

Yes love my rums ( have a 300 also & owned 5 of those over the years along with 1 , 7mm ) , the 375 rum is heading to moz in July & the h&h is getting left @ home again definitely nothing wrong with the h& h but it just doesn’t kill like the rum

Cheers

Click to expand...

Whats your go to bullet and speed for the 375 rum?