Home Forums Hunting & Shooting Express Rifles and Big Bores Only Anyone 375 Roy?

Gotta scratch a itch, never had a big bore, gonna build one. Figger 375 h&h +p without fire forming. Anyone run one? Cape buffalo is on the list...

Jud..... the 375 is not a big bore...... jeesh

Ok Jud , so here is the deal , the 375 H&H has panache the 375 Roy does not! if you shoot a cape buffalo you want to do it in style... get the H&H ..... I am building one as we speak....

Steve Barnett's fine guns has one I've been lusting over for years. It's a hard use Weatherby Custom. If he'd drop the price a bit I'd likely do something stupid, as I've already have a nice H&H.

Hey Judman you get one I got a set of RCBS dies I'll sell you right. Mb

Already got the barrel and stock ordered, lookin for a action

I’ll take em pard..

A "bit" of work but I have a mint numbers matching 1909 Argie action...

Appreciate it big Ed, but I’m sweet on 700’s. Much obliged

I had a 375 Mashburn (just one of several improved H&H versions which are all pretty much the same); thought the name sounded like the what the cartridge was. 🙂.

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/2771075/page/1

Had the 375Wby for many years as well as the H&H. If you’re gonna stay with 300gr bullets the Wby will push them quite a lot faster if desired but can be down loaded to H&H levels if the recoil of full loads proves a bit too much. I’ve found it to be every bit as stout as a 416 Rem. Can also shoot factory H&H rounds in it with no problem.

Yep, thanks

Riflecrank on the 458 thread, has done extensive work with the 375 WBY.

@Riflecrank

Very extensive

I have a Zastava 375 Wby rechambered from 375 H&H. I also had a 270, a 257 Wby and a 7mm Rem Mag, all are down the road now. I simply stopped using them once the 375 turned up. My rifle has a Ledgandary arms works fiberglass stock and a Loopy VX2 2-7x33 and weighs 8.5Lbs loaded ready to go.It shoots 225gn Hornady 235gn Speer and 235gn TSX bullets all to the same POI, and will be at home with those loads on anything I point it at in Oz.

My rifle is so accurate I can use it as a spotlighting rifle shooting out a 4WD window at foxes, feral cats and 'roo's. The last 2 shots I fired from it hit a 3x3" steel plate at 300 yards with only a little hold over.

I think its a brilliant, flexible well mannered calibre and can reccoment it.

Thanks for the flowers guys.
It is a favorite, second only to the .458 WM.
I was going to reply until Judman mentioned Remington and I lost interest.
He could join accuratereloadingdotcom long enough to search posts by RIP related to the 375 WBY,
and then run from that place.

Your a dumbfuuck, got it... 👍

Thanks for the reply! 😘

Ok then,,,,, this is what it should look like when your done.....

I have a 375 H&H AI and I like it quite a bit. I think the Weatherby would be it's ballistic twin. Mine happens to be a pre-64 Winchester. The 700 would handle over pressure and gas escaping much better.

Ooh ! Mighty thinskinned about the M700, eh ?
I am too !
Whatever you do, use the latest C.I.P. homologation of the .375 Weatherby Magnum, circa 2001 Weatherby redesign, revised in CIP circa 2002, IIRC.
Don't get the old 1945 version reamer.

My first in 1987 Alaska, also was my first "semi-custom" rifle and the next-to-fugliest one I still own.
It was the first rifle I ever had a gunsmith build for me, and he was allergic to epoxy, so this is the first rifle stock I ever bedded and finished exteriorly.
It is a Brown Precision, believe it or not, smeared with epoxy and sprayed with Krylon.



Nirvana occurred after 2001:





Above was a 300-gr bullet loaded longer than 3.600" COL because of the weird bullet anatomy,
and it used uncharacteristically fast powder for the unusual bullet.
Generally, H4350 with 300-grainers is the way to go with the .375 WBY.

The only weakness of the .375 WBY is lack of magazine space for long-nosed bullets to work through the magazine,
unless you get a 3.8" magazine or a single shot rifle:



Though I have full-custom .375/.338 Lapua Magnum (9.5x70mm Tornado) and .375/.404 Jeffery rifles,
I had them built with custom reamers utilizing the .375 Weatherby Magnum throat of CIP 2002,
both with fluted, stainless Lilja No. 6 sporter contours, 26" long.
One is as good as another among all three chamberings, no significant difference.
24" barrel will be about 50 to 60 fps slower than 26" barrel,
Expect 300-grainer MV of 2740 fps to 2800 fps for .375 WBY, with 24" to 26" barrel.
Simply re-chambering a .375 H&H to .375 WBY is very worthwhile, and a cost-effective way to get a .375 WBY.
Remember, use the correct reamer.

A funny thing about the Mark V DGR Weatherby makes, even with the drop floor plate, they manage to limit it to only 3 down in .375 WBY,
yet they use a flat follower and get 3 down with the .378, .416, and .460 WBY.
I have one in .416 WBY, would have gotten it in .375 WBY except for the silly drop floorplate that allows only 3 down in the DGR.

I must confess that I do have a Remington M700LSS .375 RUM factory rifle hiding in the safe.
It has a slender 26" slick barrel.
On 11-18-2001 at 70*F in KY, I chronographed 20 rounds of Remington factory 300-gr Swift A-Frame ammo.
5-yard chrono readings:
Ave = 2780 fps
ES = 80 fps
St. dev. = 24 fps,
Correction to MV = 2794 fps.

The best 3-shot group during that session at 100-yard targets was 0.52 MOA.
Sometimes I get lucky and get 3 factory rounds in a row close to same velocity.

An acquaintance told me the factory load for the .375 RUM with 300-gr Swift AF can be duplicated with
93.0 grains of IMR-7828 and the Remington 9-1/2M primer in Remington brass.
And you can improve the uniformity of velocities with handloading.

By golly !
The .375 RUM performs almost as well as the .375 WBY.
But the .375 RUM burns more of a slower powder in a bigger case capacity with a shorter throat.
The .375 RUM is to the .375 WBY as the .458 Lott is to the .458 WinMag, when all are used in the same length actions.

Another neat thing about the .375 WBY is that it will totally clean up a .375 H&H chamber without setting back the barrel.
Try that with a .375 RUM reamer in a .375 H&H chamber and you will get a deformed/compound shoulder on your .375 RUM chamber.
You have to set the .375 H&H barrel back to re-chamber to .375 RUM.

Sure the Remington M700 is acccurate and a strong action,
But one bad experience of having its extractor shaving brass filings that clog up that tiny little plunger ejector can make a lasting impression.
I save my Rem M700 .375 RUM for show and tell purposes,
just like the 7mm STW and the .300 WBY M700's I purchased before I knew any better.
That is all I allow to keep themselves company in the safe.
They are accurate and strong and light weight, but they make me nervous with their extractors and ejectors and controversy over the safeties,
the latter issue never being an issue for me.
Knock wood.

Oh nice talk... I’ll letcha flap your lips about controlled feed bullshiit while I do my thang with push feed.... while laying on my back, pretending things went “bad”.... haha

The dumbat their finest!! 👍👍👍

Buff meets 416 Rem at 130 yards. Boom, stumble two steps, boom falls over. Little 350 gr TSX.

EdM,

Nice buffalo.
I sure hope that is a Wisner copy of the "African" Winchester rear sight
on a fine custom rifle,
and not one of those pot metal Remington rear sights.
Kind of hard to see.
Please show and tell more about that rifle.

350-gr TSX from a .416 RemMag, eh? How fast was that bullet going when it left the rifle ?

For comparison, keeping it .375 WBY related, I have a handload for the Barnes Original 350-grainer, and a few more tidbits.

Brass: .375 WBY formed from Hornady basic cylindrical H&H brass, trimmed to 2.850", and necks annealed.
Primer: Federal GM215M or F215 (same/same)
Powder: Norma MRP 90.0 grains
Temperature 50 degrees F
Bullet: 350-gr Barnes Original, BC = 0.370, SD = 0.356
5-yard velocity = 2563 fps
MV = 2575 fps
KE = 5153 ft-lbs
Accuracy: Just under 1.5 MOA for 3 shots at 100 yards, 24"-barreled Winchester M70 Classic Stainless rechambered from .375 H&H,

Same rifle, powder and other load specifics/conditions as above except with 300-grainer and 2 gr more powder:
92.0 gr Norma MRP
Bullet: 300-gr Sierra GameKing, BC = 0.458, SD = 0.305
5-yard velocity = 2742 fps
MV = 2752 fps
KE = 5045 ft-lbs
Accuracy: Just under 1.0 MOA for 3 shots at 100 yards.

Same day, same rifle, .375 Weatherby Magnum factory ammo, with COL = 3.565", containing 88.5 grains of unknown powder (N-204?):
Bullet : 300-gr Nosler Partition, BC = 0.398, SD = 0,305
5-yard velocity = 2734 fps
MV = 2745 fps
KE = 5019 ft-lbs
Accuracy: 1.0 MOA for 3 shots at 100 yards.

The Weatherby factory ammo claim of 2800 fps with 300-grainer in a 26" barrel is spot-on, compared to my 24" barrel.

Also of note:
The properly headstamped, Norma-made .375 WBY brass has a greater water capacity than brass made from W-W .375 H&H or Hornady basic.
111.5 grains H2O for Norma brass at 2.860" maximum length.
108.4 grains H2O for fire-formed W-W .375 H&H that comes out short at 2.832" after fire-forming.
108.2 grains H2O for the Hornady basic brass at trim-to-length of 2.850".

I later discovered that H4350 in the Norma brass with any 300-grain bullet preferred is the way to go for one bullet weight does all in the .375 Weatherby,
with better accuracy and top velocity.
I also discovered that the make of bullet used has a lot to do with accuracy of the rifle. Duh.

Never heard of Leroy or Jim, though I remember their shop from, oh, 1982 or thereabouts... grin

Some great performance from lighter bullets in the H&H... If heavies interest you, the BEE is the better design. I have necked down the WBY.375 case to 9.3 MM . (Now that there ,is something that needs looking into. I call it a 360 WBY.) I feel the 350 Barnes RN was the reason the BEE came into it's very small window of popularity. There were no reasonable 40 caliber rifles back then. A 350 at 300 speed seemed a bit better Buff cartridge. Remember all it took was an oil man or a banker and a gun writer to sell a few magazines and make Joe Lunchbox wish he could go to Africa. Herter had a book about going to Africa for $630 !

Riflecrank,
What velocities were you getting with the 375 WBY and the 270 & 300 grain Barnes TSX ?
The 375 WBY is an intriguing cartridge.

I bought a used Remington custom shop rifle that was advertised as a 375 H&H but was a bit surprised when the cases of the first loads I tried came out with the Weatherby shoulder. I thought about returning it but it is so accurate I had to keep it.

Lol 😂. I bet looking at that fired brass the first time was a heck of a surprise!!

My early Sako FN 98 in 375 Wby. This is one of my favorite rifles. The basket weave is meticulously done hand carved. Has one standing/one folding. The Timney trigger is light and crisp. It is presently wearing a Loopy 2.5-8, not the Burris 3.5-10 in the photo.

Great rifle and cartridge. Thanks for sharing the pictures.

My 375 H&H AI will shoot the 375 Weatherby in it, but it's almost the same ballistics. Main difference is the shoulder. I like it and it is a pleasure to shoot - not hard recoiling.

I have had a 375 Wby as well as two 375 Improved 40 degree rifles. I got increased velocities but also got recoil more like a 416 rather than the 375 H&H. I sold all three. I would rather have more bore and bullet weight if I am going to get that level of pounding. The RUM is even more “excitement”.

Incidentally if your M700 is accumulating brass shaving which clog the ejector then you may want to back your loads down and eliminate the brass extrusion.

ldmay375,
Sorry, but the TSX did not exist when I settled on the 300-gr Nosler in the .375 Wby to match the factory ammo.
I later shot TSX bullets in the .375/.338 Lapua and .375/404 Jeffery.
Fine bullets, the TSX and TTSX. You will not go wrong there.

True. I was using Remington factory .375 H&H ammo when that happened to me.
It just ruined me on Remington, at a young and impressionable age.

Good for jackrabbits though. I had one and never even fired it. Bought it for $600.00. Sold it on GB for $1,600.00. Didn't even last 2 days there:



I don't get the, lets build a custom for $2,000.00+ idea, when there are so many damn good used rifles out there that can be had for excellent deals.. Often times these "big bores" never even get fired, so when you find one they are generally great shooters. The pre 64 375H&H I did have and later sold to gunner is a "one holer"...

I would never run a 700. Model 70 is where its at, or even a Whitworth or commercial Mauser, but not a 700. Akin to running a Leupold rifle scope...

bsa1917hunter,
You were plumb righteous until you badmouthed Leupold.
Nothing wrong with a Leupold 2.5X20mm Ultralight or 2.5-8X36mm.
I'll take one each of those for any rifle known to man.

You've been lucky then, I've had enough Leopold problems that I eliminated them on my rifles.

Please tell us about all your Leupie problems as you seem to be very unique.

I have 17 and NONE have ever had any problems.

"Buy Chink, Help Biden!"

jwp475,

Being superstitious about it, I spell it "LEUPOLD" and pronounce it "LOOPOLD" for better luck.
Out of 40 Leupold scopes I had to send 2 back, for repair at no charge.
Those two boogered ones were like the 6.5-20x40mm AO and such, on modest recoiling calibers.
Should do fine on .223-cals.
The two Leupold problems I had on higher power variables:
Windage adjust stopped working on one.
Power change ring got stuck on the other, I did not try Vise Grip plyers before I sent it back.

I am aware that Michael McCourry busted some of the more rugged models of Leupolds and then pronounced Nikon as more rugged.
So I have had about 20 Nikons and had to send one of them back.
It was a 3-9x40mm SlugHunter that survived over 400 rounds of .458 Winchester Magnum rounds on an 8-pound rifle
with LongCOL 500-grainers up to 2342 fps MV, shooting bugholes at 2250 fps, a bit over 1 MOA at 2342 fps.
That scope never showed any loss of function at all,
but the little O-ring in front of the objective lens started extruding from under the thin ring that screws into the inside of the objective bell.
That is a shock absorbing lock on the objective lens to keep it from exiting the front of the scope.
That lock ring must have started backing out due to recoil. A special spanner wrench is needed to keep that tight.
Nikon replaced the SlugHunter with the next version P3 Shotgun scope, no charge to me.

Nikon has quit the rifle scope business. Weaver too.

Leupold is still here, and my track record with them (2 out of 40) is as good as my record with Nikon (1 out of 20).
I will never get as much experience with other brands, I am sure.
Still trying to bust the other brands I have in lesser numbers.
My next most plentiful is Sightron.
I have one S&B that cost as much as a dozen Nikon P3 Shotgun.
I would rather have a dozen Nikon.

It is a sad sign of the times for Weaver and Nikon to quit rifle scope making.

What brand(s) is(are) next, or already gone ?

Same here, I’ve got a 375 Improved. I haven’t done a ton with it, mainly just shoot 250 TTSX’s with RL16 a bit over 2900. Kinda like a big 30-06. I’ve got some 300’s I need to monkey with one of these days.

I must concur. Everything I’ve learned from him just went out the window…. I will admit I generally go Burris these days however.

I've owned quite a few Leupolds. I've sent three back for repair. Two were fixed, one was not - the repair department couldn't find anything wrong with it. But groups with that scope were not good and changing scopes made all the difference in the world. I still own a lot of Leupolds. I wonder about they guy who couldn't find anything wrong with that scope... Was it one bad guy/tester? Was their testing the fault? I don't know.
What I do know, is I think that a scope that does not fail is many times more important than lifetime warranty, perfect lens, pretty much anything to do with a scope.
What's important to me:
does not fail, good lens, enough eye relief, once sighted in - always sighted in, crosshairs, focus, ease of adjusting POI, warranty

I took a 280 out for a prairie deer hunt. It shot 1/2 MOA groups with the load I was using. I had a standing broadside shot at a nice White Tail. The bullet landed between the legs of the deer. I had a spare rifle in the truck and finished the hunt successfully. When I got back to the range the bullets landed way way low and way to the right. That was over 30 years ago, I don't recall what scope I had on that rifle. But choosing a scope after that episode was quite a bit more important for me.

Mine will be a 700 and wear a leupold. That’ll bring out the whiners for sure!! Haha

best rifle on the market!

Agreed.👍

I shoot 300 gr. NAB in my 375 Bee using 85.0gr. RL-17 In a formed WW case lit by a CCI 250.
It spits out the 300 out at 2779 fps and delivers 5146 fp at the muzzle in the process.

I’m sure now that I won’t go to Africa again. I went there (Cameroon) on a mission trip in ‘98. I saw Hippos, hyenas, various types of deer/antelope, monkeys and there were croc’s there. I think I was the only one in the group who didn’t see the croc’s. The village we were in had elephants visiting now and then - missed that too.
So what to shoot with a 375 H&H AI here in the good old USA? Maybe a buffalo in a high fence ranch in Texas or a bison here in South Dakota. My freezers are full and I might need to buy another, so getting a lot of meat isn’t real important this year.

If you were to go to a Texas high fence ranch what bullets would you load?

I vote .404 Jeff.

As far as problems with extraction I have had a Mauser that failed and a pre-64 Winchester that failed. I never had a problem with a 700 for extraction. I own well over 20 700's, a couple Mausers and I am down to two pre-64 70's. The pre-64 70's are 375 H&H AI & 300 H&H. I'm not sure how many Mausers I've had - maybe a dozen??? But I have had a few classic 70's and one other pre-64 70.

I don't understand the idea that having a high pressure round causing a failure is the Manufacturer/model's problem. I know that the failure on the Mauser was my fault. I was a bit younger and didn't know that WW760 and WW760-BR were way different powders.

Yeah, other than taking a Cape buffalo with one, have had the vanilla H&H and a 375 Mashburn. The latter is just one of a handful of improved 375 H&H’s. All variations on a theme.

The 375 H&H is an excellent, manageable, medium bore cartridge by itself. Took ten plains game with the H&H. I always thought that when the 250-gr TTSX was introduced, it was now perfect for elk too. Most rifles rifles so-chambered are too heavy though IMO. 8 1/2 lbs all up would be my huckleberry. 👍.

Edit: apologies for forgetting I posted on this previously.

FWIW, with the Wby factory-loaded 300-gr NP, I got 2,752 fps at the muzzle out of the 24” bbl of my .375 Wby DGR. With the Nosler factory-loaded 260-gr AB, I got 2,975 fps at the muzzle.


This is not correct. To double-check, I just reloaded 4 down with one in the chamber in my .375 Wby DGR. I tested many times before my bear hunt and it fed all four following rounds without issue.

This is four down and one loosely in the chamber just now with the drop plate I got back in 2009 I think.



Only shot one thing with it, but it worked with one double-lung shot.

MarineHawk,

I like your 4 down and one in the chamber; just like my Winchester 1895 .405 WCF which shoots 210, 300, 400 grain bullets depending on what you want to hunt.
I jumped from .338 Win to .405 Win to .458 Win and skipped all in between. Saved time and BS.
Took water buff with 300 grain NF and Cape Buff with 400 grain Woodie.


BTW, very nice bear!

Nice Buff CRS!

I've thought about getting a .400+, but I'm getting fairly confident that I'll never shoot at anything my .375 Wby won't handle superbly, and my .340 Wby will do anything it will do as well, I firmly believe.

MarineHawk,
I see you have the Wby DGR with the
Winchester African rear sight.
More desirable, contracted part from Wisner.
They cheapened the rear sight since then.
They advertise 3+1 for mag capacity, even with the drop box.
That is indeed ridiculous since my .416 WBY is 3+1, with same box.
It does take some screwing with a thick follower
and/or hump-bottomed spring to limit it to a very easy 3+1 mag capacity in .375 WBY,
but it can be done, and is claimed by the factory.

Riflecrank:
Perhaps something has changed in recent decades.
My 2009 comment above was a year off now that I’ve thought about it.
I bought it used in 2010 from an older guy whose plan had been to go to African and hunt big things, but he gave up on that. It had less than 2 boxes of ammo through it. I think it was manufactured around 10 years earlier IIRC.
It was stock without the drop box at the time.
At the time, I called Wby, and they told me I could get one more down if I bought and installed the drop box. That’s exactly what happened.
I bought and installed the drop box with no further mods myself back then, and it went from 3 down to 4 down.
It most definitively and easily does 4+1 since then.

It is all true then.
The original Wby DGR .375 Wby without the drop floorplate was 3+1.
They used the drop floorplate on the .378 Wby, .416 Wby and .460 Wby for also 3+1.

Lately they have replaced the Wisner rear sight with one by NECG,
and they are using a drop floorplate on the H&H-based chamberings,
but limiting the capacity to 3+1 with the follower and springs used.
That is silly, that's my point.

I have a circa 1985-1986 Fibermark Wby Mark V .340 Wby.
That was the first factory rifle for big game with a synthetic stock.
McMillan did it with black wrinkle paint back then, before they learned to do the McSwirly finish.
I have tried that drop floorplate, ordered from Weatherby Custom Shop on the .340 Wby.
Yes indeed, easy 4+1,
just like on your .375 Wby DGR.
Just need the original follower and spring and add the drop floorplate, which is a pocket plate or coffin plate.

That drop floor plate also converted my .30/.378 Mark V Synthetic from 2+1 to 3+1 when I re-barreled it to .510/.338 Lapua Improved.
I understand.

That "then new" old .340 Wby Fibermark accompanied me on my first trip to Kodiak in August 1986,
then on a solo caribou hunt for a week on the Alaska Peninsula in November 1986.
Second trip to Kodiak in 1987, I had a .375 WBY.
I should've had a Four Five Eight,
luckily I lived to tell of it anyway.

Thanks for the explanation Riflecrank!

My .340 Accumark also does 4+1 with the drop plate, but it also is from the late ‘90s.

This lazy moose likes to sleep with it.

Got the barrel, 375 is the dimple fluted snout. Need to get a action and stock. I’ll get er done one of these years

375’s are just cool in my book. I like mine quite a lot!

Even cooler when necked up to 416 😭😭😭

Just stop it JWP…. YOU already got me on the 500 JRH…. ONCE a year is all I’ll let you bully me.

ROTFLMAO

One thing about the “improved” cartridges: If you’re happy with top velocity with the “unimproved” cartridge, you can reach that velocity at a lower pressure with your AI or Weatherby.

I’ve always liked the H&H version and I had one and my 375 AI at the same time. I decided to sell one. Both were fine rifles in my opinion, but I really liked the pre-64 trigger and I could shoot it more accurately and the felt recoil seemed less. I suspect that the Winchester’s stock fit better. So far I’ve only shoot full power loads in my AI a few times.

I had a friend that used his 375 H&H on elk and he thought it was the perfect cartridge for such. I guess people will have individual preferences. I certainly have mine.

Might have a 700 action for Judman. It is currently a 270 Weatherby that has been a real disappointment for a custom rifle. The barrel just ain't right and the gunsmith had health problems and died before it was resolved.

I also ended up with 2 1/2 boxes of 375 Weatherby factory loads through an auction. Bought for a friend who recently went through some health issues and won't ever be shooting something like a 375 again.

Paging Jud.... hello Jud, we need an update on the 375....

I finally got my Mauser 375 barrel action back from the gunsmith after a 2 yr wait... got it stocked in a nice piece of English walnut and will be posting build pic's soon.

Judman, I sent you a PM

My 375 H&H I mentioned earlier, went from this...




Too this, the last few days... almost done, will shoot it tomorrow...

375 Roy - Sako/FN.

Like this one?

My pre-64 375 H&H AI seems to be awesome. But I’m getting long in the tooth and my body says no way when I considerAfrica.

Is yours a rechambered M70 375 or a different version altogether?









Mine started life as a 300 H&H someone rechambered to 300 Wby. Couldn’t begin to beg it to shoot. Had JES rebore and rechamber to 375 Improved with a 1-10 twist. I also had a Legend kicking around so that’s what it got. Pretty nice handling 375 now.

Ooooops sorry guys, don't scroll through every sub forum, waiting for a action still. Obviously not to high on the priority list, but will update.👍

I have a Win. Stainless Classic with a muzzle Brake and a Hogue stock, New Haven that shoots great but haven't decided on a load yet due to lack of components and cash. Only shoot it in the Very Early cold months. $800.00 out the door.

Brass is .300 H&H up to the current .340 WBY---all reformed/fireformed!

Hip