I'm not really asking which one is better. I foubd a 375 Weatherby that I sorta liked and would like to hear a little more about them.

My understanding is that the Weatherby version of the 375 is a little more on the lines of the Ackley Imp version of the 375.

I believe that you could shoot 375 H&H brass into your Ackley Imp 375, thereby creating Ackley Imp brass.

That being said, would you be able to shoot 375 H&H in your 375 Weatherby and create 375 Weatherby brass? I don't think I'd be that interested in the 375 Weatherby if I couldn't also use H&H rounds in it.

yes you can

Dober

Yep you can fireform the .375 cases in a 375 Wby..I have seen probably 40 buffalo killed with the equivelent of a .375 Wby by Saeed of AR fame....He really knocks them down with his 375/404 and the two are equal for all practical purposes. The fast 375s are pretty impressive with good bullets..The are fast enough to probably best be used with monolithic hollow points.

I didn't realize that the Weatherby was that much harder hitting than the H&H. Is the recoil a lot stronger too?

Since you can use the hotter Weatherby loads as well as the milder and more available H&H loads, it would seem like it offers the best of both worlds. If you reload, you could always load down the new fireformed Weatherby brass to milder levels.

I love mine, an FN action Sako...Has one standing, one folding and 3-position safety, and is spooky accurate. I get on average around 120 FPS more velocity with it over my Pre-64 Mdl 70 375 H&H. You can shoot 375 H&H ammo in it, and it fire forms to the Wby round. I find the necks tend to be a tad shorter than the Wby factory brass, however.

What I hit with either doesn't know there is any difference.

L2S.... NICE FN custom there!

As stated above, the 375WBY is a versatile round and is the best of two worlds. No downside, lots of upside.

If this rifle in question is is a controlled round feed bolt action of good quality such as a correctly set up Mauser of some sort or model 70 then grab it.

It only has two negatives when compared to the 375.

1) Dies are not as readily available and depending on brand are more costly. I think they are Group G with RCBS.

2) In the case of top end custom wood gun on something like a M98 or M70 I think resale value would take a dive if 375 Wby was on the barrel instead of 375 H&H

If you search on AR's Big Bore forum there is heaps of stuff.

Exactly!

It makes for some REAL bargains, too. I was able to swipe my FN/Sako for great price a while back. It will be one of the last in the safes to go, at any price.

Downside to the round:

1. Expensive brass
2. REAL expensive ammo, if you can find it.
3. Dies cost around $50.00
4. Can't pop into Grubb & Hilda's Gas-N-Stuff in Edgeworld ID and find ammo.

But you can use 375 H&H ammo and brass.

Yeppers

It would sell well if Wby introduced it in the cheap Synthetic Mark V as they alreads sell plenty in 375 H&H. But I reckon Wby would see the 375 Wby taking 340 sales and then shooters buying 375 H&H brass/ammo instead of 340 stuff.

You still have go the step to fire form it, and the factory 375 H&H doesn't print the same as the Wby loads.

Still...all-in-all, I love the round.

I am leaving to go brown bear hunting in 3 days. I considered all possible options, and price, within reason, wasn't the main factor. I chose a Wby DGR rifle in .375 Wby.



A good .375 H&H clearly is ceaper to acquire and fire.

FWIW, I already own and love a Wby Accumark in .340, so I am vary familiar with the rifle, and I got a good deal on the .375. But I love this cartridge/rife, and would only shoot the .375 H&H through it in a real pinch (unavailability).

My rifle's accuracy makes me look good when I don't deserve it. The .375 Wby will do this (first two Oehler chronographed from my gun--the 350gr TSX is from reports from others):

375 WEATHERBY � NOSLER 260 GRAIN ACCUBOND (B.C. 0.473; 260 yd zero)
Yds / Vel. / Impact / KE / Drift
000 / 3040 / -1.75 / 5336 / 000
050 / 2932 / 0.88 / 4963 / 0.59
100 / 2831 / 2.52 / 4627 / 1.05
150 / 2733 / 3.05 / 4312 / 1.83
200 / 2637 / 2.43 / 4015 / 2.94
250 / 2543 / 0.53 / 3734 / 4.40
300 / 2452 / -2.70 / 3471 / 6.23
350 / 2362 / -7.39 / 3221 / 8.44
400 / 2275 / -13.63 / 2988 / 11.05
450 / 2189 / -21.57 / 2766 / 14.09

375 WEATHERBY � WBY 300 GRAIN NOSLER PARTITION (B.C. 0.398; 240 yd zero)
Yds / Vel. / Impact / KE / Drift
000 / 2830 / -1.75 / 5335 / 0.00
050 / 2708 / 1.07 / 4885 / 0.64
100 / 2595 / 2.70 / 4486 / 1.25
150 / 2484 / 3.04 / 4110 / 2.28
200 / 2377 / 1.97 / 3764 / 3.76
250 / 2273 / -0.65 / 3442 / 5.73
300 / 2171 / -4.96 / 3140 / 8.19
350 / 2072 / -11.13 / 2860 / 11.21
400 / 1975 / -19.32 / 2598 / 14.80

375 WEATHERBY � HANDLOAD 350 GRAIN TSX (B.C. 0.425; 222 yd zero)
Yds / Vel. / Impact / KE / Drift
000 / 2550 / -1.75 / 5054 / 0.00
050 / 2444 / 1.34 / 4642 / 0.65
100 / 2344 / 2.97 / 4270 / 1.30
150 / 2248 / 3.01 / 3928 / 2.41
200 / 2153 / 1.32 / 3603 / 4.01
250 / 2060 / -2.24 / 3298 / 6.12
300 / 1970 / -7.86 / 3016 / 8.77
350 / 1883 / -15.73 / 2756 / 12.02

Not quite the same but I have had 358 STA which as you probably know is based on 375 blown out. I was able to work up loads I used in the unfireformed brass where I had point of impact in line. From memory I used 200 grain Hornadies and a backed off load of Varget Maybe 75 grains) in the unformed brass. That load would also shoot to the same group when used in formed brass. But I use a lot of reduced loads so it fitted in real well.

MarineHawk

They are high velocities for the 260 and 300 grain and from 24" barrel

What loads are you using. Had you not mentioned "Ohler" my first thought would have been "Chrony" at work

I have a fireforming load with 270 Hornadays that shoots to the same POI as a hunting load with the Accus @ 2900 . I can reach 3000 with the Accus in my 24 inch barrel with a case full of Ramshot Hunter , but the POA is then slightly off the fireforming load .


Weatherby factory ammo with the 300 Nosler also hits 2800 in my gun , but that's not with a chrony or a Oehler either...ProChrono in my case (grin)

They are the Wby and Nosler factory loads. I chronoed them back in April through someone else's Oehler chrono that looked like it would make NASA jealous. It's possible that it was off, but I doubt it. In any event, they're only 30-40 fps faster than the manufacturers' published numbers.

I have found that by using Hornady Basic Belted Magnum brass, I can just run them through the FL sizer and trim, and it makes perfect .375 Weatherby brass.

A newer solution to an old problem...good thinking!

yea, that would probably save me some $$ getting formed .375 AI brass, too

Tom Smith,
The 375 Wby can add a good deal of velocity especially with heavy bullets but if it's "that much better" is up for grab. Some think so and it certainly works on big stuff with proper bullets, particularly monolithics.

Personally, I am more than satisfied with the 375 Holland and Holland, but that has to be a personal choice and since I have never had any problems killing anything with a 375 H&H it is my choice..If I want more then I drag out my .416 Rem.

Another plug for the .375 Roy.

H-414 is one of my favorite powders. You can get some really good numbers out of it. Especially with a 26" barrel. Mine's right at 8 1/2 lbs. scoped and loaded. It's on the snappy side when it goes off. But not terribly hateful.

Previous poster was right. If they'd put it in a Mark V synthetic, they'd sell like hotcakes.

I have been a life long keen 375 bore person and that interest has extended to observing other people with their purchases.

Over the years in Australia I have seen many people who buy a 375 and especially the CZ and with the intention of rechambering to 375 Wby. Similar situation exists with the Wby Mark V Synthetic in 375 H&H. However, when they get their 375 H&H and test a few loads and sight in etc. the desire for more power and recoil is at an all time low Used to see the same thing with CZ 458 Winchesters that were purhcased with rechambering to 458 Lott being the intent.

If you read these forums enough then after a while the 375 H&H and 458 Winchester take on the dimension of a low powered calibre suitable for indoor use.

I think that The 375 AI is the only way to go if you want to excede H&H velosities. Why start out with a big powder volume of the 375 Roy and its frebore? The 375 AI round will do anything that the Roy will do: and have more barrel life. It's no harder to fireform, runs standard 375H&H loads if necessary, and must hold at least as much powder.

For loading data use published 375 Roy data to start. I stay away from all of the Weatherby rounds on purpose.

I don't think barrel life is much of a factor in a round that pounds.

I on the other hand , can see little reason to choose the AI version over Weatherby . Barrel life ahould be as near identical as you can make it , at any rate these are not cartridges for shooting gophers or groundhogs (well , maybe Dober would..grin) The powder capacities are about the same and the freebore is a moot point .


The Roy version has several advantages going for it in my book , including the factory brass if you so desire , readily available loading data , and at least 2 brands of factory ammo . Also maybe eaiser feeding . The Roy feeds just as well as the vaunted H&H case IME . Rounded corners slide easier than sharp corners .


Some of the Weatherby cartridges are classics in their own right , the 300 and 375 being 2 .

"a round that pounds", I likey that...

Dober

Laffin here... .

IME the 375 AI pushes a 275 gr BBC at a bit over 2900 fps;about the same as a standard H&H pushes a 250;the H&H round will do an easy 2750 fps(maybe a hair more depending on the barrel used) with the same 275 gr bullet and RL15.I suspect the velocity differences will hold true with all bullet weights commonly used.

The AI can use slower powders than the standard H&H,and more of it for that 100-150 fps gain, which translates into a substantial jump in recoil for the AI. Only the shooter can determine if it's worth the recoil increase.For me it never was...

There isn't enough difference between the AI and the Weatherby to spit on....

Another red-herring I have to snicker at is the issue of "Weatherby Freebore." For one thing, all of my older Weatherbys that have a lot of it, are very accurate (sub MOA) and freeboring was the thing to do with the available powders at the time. With the advent of slower powders we have today, I think most Weatherby haters will be surprised at the amount of freebore in modern Weatherby rifles.

The 375 Weatherby was a stepping stone for them eventually leading to the 378 that with modern bullets is an absolute hammer and while not as popular as the H&H of which I own two, ammo is readily available worldwide. Try finding ammo for your "AI" in Africa or for that matter ANYWHERE in the US if the airlines gooned up your luggage. Lastly, I must admit I was never impressed with Ackley. If his stuff was so good, how come we don't see them like we do Weatherbys?

i haven't played with RL 17 in my 375 roy yet , but I suspect it will push a 270 grainer very, very close to an honest 3000 fps.......H4350 or RL 19 will easily get 2950 .

when the same barrel had an H&H chamber , I could barely get the 250 Sierra to +2800 . A 235 barnes would do a little over 2900 , this with RL 15 .

sd: I just clocked the 250 from my 375H&H at 2940 recently,a velocity level I have been getting with no ill effects since the 80's;barrel is a 24" Krieger,but have gotten similar results from the pre 64 M70 barrels I have shot extensively,many of which are somewhat oversized.

So much of this depends on the barrel,throating, etc.

Bob , I think it has something to do with the long factory throating my M-70 came with , at any rate it seemed there was a brick wall you would hit where adding more powder would not increase the velocity .

Another 375 in my possesion , a Whitworth , would just barely make 2700 with 270 gr without sticky extraction , no matter the powder tried . It was a stretch to get 250 s to 2750 with RL 15 .

I've read alot on the net about hot 375 H&H loads that would do well over 2800 with 270 s , but I couldn't get there with the 2 I tried....admittedly a small sample .

I agree with Mike378..One thing I have noticed over the years is that the 375 Wby, the 458 Win. and the 44 magnum and those calibers above them are never in much used condition and they all have prestine bores! Go figure!

SD: Yup it's all in the alchemy of groove diameter, bore smoothness, throats, etc.,mysterious factors beyond my ability to comprehend....also certain bullets measure different,have more or less bearing surface,etc.I measured some 270 cal 130 gr screw machine partitions this morning that all measured .276...add that to a barrel slightly oversized,and who knows what will happen!

And we wonder why we all wind up with different results!

One guy doesn't understand using a Wby that another posters swears by, when a IMP ackley is just almost as good and I don't see either that much better than my beloved .375 H&H since it has never failed me on anything, anywhere.

Darn it, I have believed that a 250 gr. Sierra at 2800 FPS in my H&H would work on about anything under all circumstances?? Now I'm being told 2950 to 3000 is better, I suppose it is but for what is my next question?

Darn, guess its still up for grabs which one you pick!

I have both calibers but that Wby .375 will leave a lasting impression on your upper torso once you get over the 2600fps mark. I myself see very little difference between the two as Mr. Atkinson stated.

"Improved"375H&H is an oxymoron.....

I have no reason to disparage any of the other .375s, but I just took a 9'-2" brown bear in SW Alaska with a 27-7/16" skull. I shot him offhand at 97 yards with the .375 Wby. My guide who had been involved in more than 30 brown bear kills as a hunter and guide over 23 years, said that it was the quickest non-head-shot kill he had ever seen on a brown bear of any size. The bear bolted forward (what we later measured as) about 25 feet, spun violently to his right (guide said to bite what was biting him) and drove his face in the ground. The bear's movements only lasted about 1.5 seconds after the shot. No blood trail to follow.

300gr NP exited the muzzle at about 2,830 fps and entered behind the right shoulder at a little more than 2,600 fps, blew up both lungs and who knows what else, and exited effortlessly into the blueberry bushes on the other side.









My guide, with all of his experience, was amazed. I'm sure other .375s would have done well, but I'm not selling my .375 Wby anytime soon.

More details here.

Congrats on the bear!

MH: Congrats! Nice bear!Typical 300 gr Nosler performance.

Yes, 375's work...all of them.

Congrats on a good bear!!! In my opinion the 375s are the very best bear calibers...90% of the guides I know use the 375 H&H as back-ups...I've taken 15 of my 19 NA bears with my 375 H&H using 275 BBC loaded to 2850 from my pre-64 M 70...this Fall I am using the 250 BBC loaded to 2950 as I will be doing a Brown Bear/Mtn Goat combo hunt Oct 3-17th in Unit 6...

Thanks guys. I can't express what a huge deal this was to me. I hit me hardest at a small airport in AK when most of the 35 other hunters or so had a little longer faces. Only one other got a browny, and it was 7.5' sow. Still a great bear, but it drove home how fortunate I was. I felt bad for many of the dissapointed hunters, but it made me more-fully absorb how lucky I was.

I know some think it's odd, but I love this rifle, and have become so comfortable with it during the last seven months, that I may use it on a lot of medium-to-large game. The recoil just doesn't bother me anymore. If I get to hunt any DG (up through buffalo) in Africa, I can't imagine needing also to bring a smaller rifle. Even during the bear hunt, after taking the brown boar, I switched to the Nosler factory 260gr AB loads for any potential black bears, wolves, or wolverine. Because we had slightly diminished priorities of hunting (had to make noise working on the pelt, etc...) and the weather became so unseasonably hot during the remaining ten days, we barely saw a mammal for the last seven days. So I didn't get to use them (except occasionally to shoot the river before getting in the raft on rafting days for fun). I knew that they hit almost exactly two inches to the right of the 300gr NPs. I clicked the scope eight clicks to the left and shot at the base of a reed at 100 yds in the river to demonstrate to the guide and myself that it was on. It was. In any event, the 300gr NP loads trully don't bother me anymore at all. I worked hard over the months to get that way. But was surprised in mid-August when I had (when practicing loading the first round from a bolt closed on an empty chamber) gotten distracted by another inquiring range shooter and forgotten that I had not loaded a round when firing one of the shots during a fairly-long range session. The rifle surprisingly (to me) went only "click," and, even more surprisingly, I was still looking at the bullseye. I certainly didn't even feel any recoil when shooting at the bear recently.

The 260gr AB load is even milder and has great down-range numbers--both in terms of drop and retained velocity. It almost rivals my best .340 Wby loads. And, as much as I like my .340 Wby Accumark, I have become so comfortable with the .375 Wby DGR, that I have a hard time wanting to carry anything else in my planned Maryland, Virginia, W. Virginia deer and black bear hunts this fall. Just so I don't abandon the poor guy, I probably will use the .340 on a possible NC pig hunt. The friend who hunts there, told me the farmland on which we would hunt is so overrun with big pigs, that you actually regularly can get long-range shots, and there is no limit. I know most would think it is insane to hunt smaller animals with this rifle, but it feels right to me.

Yeah, I no more "need" a .375 than anything, but last year I latched onto a nice .375 H&H Ruger Number One and have really fallen hard for the rifle & cartridge. Used it on a black bear hunt here in Washington earlier this month, the 260 gr Accubond at a modest 2620 fps mv did a great job, one shot at just over 300 yards.

Really like the rifle & cartridge and figure I'll just use it on black bear & elk until I get the chance for a north-country grizzly or moose hunt, or maybe a trip to Africa. Recoil really isn't bad at all, even with full-strength 300 gr loads.

Congrats again on the bear - nice, really nice!

Guy

MH: Not insane at all....think of the scores of impala,warthogs, etc shot by hunters in Africa with 375H&H's...

Nothing like rolling a brown bear to give you confidence in a rifle!

contrats, MarineHawk. awesome!




hmmm. i guess if i needed ammo for my .375 AI in a pinch, i'd just get some .375 H&H ammo and rock on... of course the same can be done with the Wby, but IIRC you can even use the .375 WBY ammo in the .375 AI (never done it myself) so the "ammo at the Mom & Pop store" argument is a non issue.

that said, my use of the AI is to get 24" H&H velocities from a 21" barrel. seems to work. I'm running the 270 TSX right now, but i'm gonna wring out the 235 grain TSX next.

Thanks toad.

Also, maybe I'm missing something, but if I spend the dough to go to Africa, unless it's literally impossible to ship ammo there or to arrange to have my contacts there order/buy some, I will have some .375 Wby ammo waiting for me when I arrive. Also, can you not put ammo in with your locked gun case, like you can when travelling within the U.S., when flying to Africa? That's what I did when going to Alaska. I figured that, if I lost my ammo, I also would be losing my rifle, so I wouldn't be having a .375 Wby rifle without ammo under any circumstances.

Current issue of Handloader has a complete article on the 375 WM
(cartridge of the month).

I have shot beside Saeed on AR more than a few times. He was using his 375/404 and it was a great rifle and killed buffalo well..I observed him kill probably 50 buffalo over the years he hunted with us..but, I did the same thing with a 375 H&H, 450-400 and 9.3x62 and other lesser rifles..

It still boils down to where you stick a properly constructed bullet.. one big bore is no better than another except in the shooters mind...

Like Will Rogers, I've never seen a big bore that I didn't like btw....:)

Well, digging this old thread up, I have a P64 300 that was rechambered to the 300 Wby. I couldn’t get it to shoot to save my life. Tried every known accuracy load anyone had with Sierras, Hornady, Swift, Nosler, etc. tried IMR4350, 7828, RL26, RL22... nothing. Since it was already in a Mag filled Legend I decided to let JES take it out a little to 375. Figure I’ll see if I like the cartridge and I’ve done great with his other rebores.

Had him do a 3 groove, 1-10 twist on it. Figure it should turn just about anything with the 10 twist. The rifle is pretty nice so it’s a last ditch effort to keep the old barrel and breath a little life in it. I’ll lap it a little with some JB bore paste and Dyna Bore Coat it. I’m looking forward to working with it. Even have some BBCs to run in it as well.

In other words using something similar to the 375 Rem Ultra Mag. Never could understand why this beltless beauty never caught on. To me it always appeared to be similar in load reliability use to the 416 Rigby when hunting in extreme African heat. The 375 RUM can loaf along pushing 300 grain loads at 2,775 fps without breaking a sweat and remain completely reliable while delivering quite a blow. It’s upper end can go another 125 fps. Just seems like such a well designed cartridge to see it somewhat fade away. And of course Remington has done a miserable job, as usual in promoting it.

I have a 375 H&H AI, pretty much a ballistic twin to the Bee. It shoots 375 H&H ammo very well. Afterwards I have AI brass. I don't always load it to maximum power level, but it is there if I want it. Buy the Bee. You'll like it.

cool!!

A 300 grain bullet getting 2830fps!? Holy [bleep]! I get 2600fps at 57,500psi. I quit there since I was able to shoot bugholes with it. I'd wonder what's your pressure?

This is how mine ended up. Turned out real nice, at least for my needs.



It shoots Federal 300 Partitions really well and makes perfect Ackley'ed brass.



Its doing pretty nicely with 250 TTSX's as well.





I am not sure I gain a whole bunch over the standard H&H with 250's but it has plenty of room to make the 300's move out relatively quick.

“Sweet” results.....now go out and kill some stuff with it! memtb

I'm trying Memtb... May take it up for some deer hunting, that's about all I have left right now!

Good Luck! We’re down to cow elk (plus wolves and maybe a cat) now.....got “skunked” on bulls. memtb

Well, cow elk doesn't stink in my book buddy! Hope the wife and you are able to crush a couple with your hitters!

Thanks!! memtb

Well FWIW, here is my MK-V .375 Weatherby SS/DGR,,,,,,, it started out in life, as a MK-V .375 H&H SS Synthetic, that was 1995, it shot "Lights-Out", so after some yrs of procrastination,,,,, I had my Smith Punch Her Out, and it still "Shoot's-Lights Out", with either flavor of Ammo,,,, albeit, the Factory H&H Ammo does shoot alittle "Low", compared to the Factory .375 Weatherby Ammo, but it is "Consistent" with regards to this situation, and I know what to expect, and thats a "Good" thing.
LJ

I have a 375 H&H AI and a 375 Whelen AI. I had a Whitworth 375 H&H.
The former is a pre-64 model that looks like it hasn’t been hunted - prestine. The Whelen AI is a rifle I built on a Mauser action (made between the wars
The H&H AI is mild to shoot, but I have not spent long time at the bench with it. I guess I’d say the factory stock is perfect for me. The Whitworth was a little harder on me - I blame it on ‘fit’, therefore I traded it.

The Whelen AI is a pussy cat.

I think a Roy would be welcome in my safe. But to tell you the truth I don’t “need” another 375 at my age. Both my knees are now stainless steel and that adds to the lack of need of another 375. I’m afraid if I don’t go to Africa next year...

I’ve never worried about whether a Roy or a AI is better, never will. That’s a six of one a half a dozen of another.

As far as brass goes, I have picked up partial boxes of H&H ammo with one to three fired rounds at gun shows pretty cheap. I have all the brass I can use.

I tend to practice off-hand a lot and this cheap factory ammo works fine. I paid for a safari for four before my brothers died and that 375 H&H AI and a Rigby would have been the two rifles I would have taken along. I ended up giving the Safari away. If ammo was lost I’d gave used standard H&H ammo and not worried about it.

MidwayUSA had 270 grain bullets cheap a few years ago and I use them for practice too.

I see little down side to having a Roy or an AI. But a standard H&H is good too.

Bugger...

Do you ever experience headspace problems with the Whelen?

I prefer wood, but that is a real purty rig you have.

Yes, nice rig beretzs, as to all the standard H&H's, AI's, WBY's and RUM's, my pre-64 standard 375 boots out 300gr partitions at 2680, the 300gr BBW#13 solids run a flat 2700 fps, a M-70 classic AI runs 270gr TSX's up to 3100 fps across the chrono if you want, I've backed them down to an even 3K, haven't developed a solid load for the AI yet.

All loads in my 375's burn RL-17 powder, RP and Winchester brass, and FED-215 igniters.

I used the 375 for a little forked horn at home on Thanksgiving.. Apparently the 250 TTSX's work fine for deer as well. Nothing much to write home about on the entrance and exit wounds but the insides were completely churned up.

Now I can sleep.....you “bloodied” it! Congrats memtb

Its very Itro about Rifles !! and what you can do with them , the action the barrel chambering the throating even the barrels tolerance in the inside diameter, As I have a very long throat CZ 602 375 H&H and I can run with the very big dogs like 375 Weth and 375 Ruger in velocity and have no pressure problems. Its All about how >>>>YOU<<<>> set up your Rifle,. Im running on HIGH end velocity on cheap H&H And luving IT! Enjoy

I did on the first case I formed. But after that, not at all. The Whelen is also an "AI" version. I rented a reamer and bought dies. The AI version was in stock. the non-AI was a long lead time.

From what I understand the 375 Whelen has a much wider shoulder than the '06 - .441 (06) vs. .458 (375 Whelen) - or something like that. The AI has .461. -- these numbers are from what I've read and I have not verified by my measurements.

I had to modify the Mauser action a bit to get it to feed reliably. It now feeds well with the 375 W AI cases and the 35 Whelen cases necked out to 375 with a variety of bullets from the 235 Speer, to heavy blunt bullets and even flat nosed cast bullets.

I'm planning on taking it elk hunting this year.

You would think with the heavier bullet it would carry a lot more energy even with minimal velocity decrease

Just bumping this to the newer 375 BEE post.

I took my 375 H&H AI out to my range today, with a couple of loads using FC Nickel plated 375 brass:

85 grains IMR 4350 and 300 grain Hornady
82 grains RE 15 and Speer 235
Primers were 215's.

Both these loads are a little warmer than halfway between starting and maximum, I believe. My stand-up shooting bench is at 50 meters from the target. I was happy to see that both loads hit nearly the same POI. The 235 grain load shot about 3/4" and the 300 grain load shot about 6/10" groups. Center of the groups were less than 1/2" apart.

Some people complain about recoil on the 375 H&H AI (375Weatherby) and I don't understand that. Since it doesn't kick that bad. I could not handle 400 grain Rigby loads loaded near 416 Weatherby velocity - I am not immune to recoil. Those Rigby loads gave me instant headache! Sure I wouldn't want to shot that 375 all day from the sit down bench, but the recoil is greatly exaggerated, in my opinion.

As far as taking that Whelen AI elk hunting, it didn't happen. I took a 270 with 160 grain partitions instead. It worked fine.

I had back surgery earlier this year, so I am toning down my hunting this year, probably.