quote:

Originally posted by deadibob:
... The load data table seems to be missing for .375 weatherby in the reloading data section.

deadibob,

If you refer to this:

http://www.accuratereloading.com/375wby.html

Well, I posted that missing data in 2004.
It was there as late as 2009.
After that it vanished.
No explanation from Don or Saeed.
Maybe some vagary of a software changeover or whatever bug ate it?

Here is the missing load data table, scanned from a paper print of it, and more:























Since above data collected, I got acquainted with H4350.
I have had best luck with that powder in the .375 Wby, especially with 300-grain bullets.
I'll look for some more of my load data with H4350.
It is very close to what QuickLOAD says.

Some QuickLOADs for 24" barrel and COL of 3.580" with the 260-grain Nosler are below.

260-grain Nosler Ballistic Tip and 3 Powders:

H4350:



VARGET:



RELODER-15:



Here is the rifle used to shoot the data above, though the Tupperware stock was replaced with an HS Precision stock since then,
I still have that Tupperware stock:



Here is the smallest 3-shot group from the above data.
There are lots of points to shoot at on a 16"-square target at 100 yards, outdoors.
50 degrees F was the average temp for the several days of the shooting.
On 12-22-2003 it was 35* F:



Well, that's a start. More to come.

I also have a CZ 550 Magnum .375 Wby with 25" barrel,
and a Mark X Whitworth with 24" barrel,
which was the cause of my first trip to a gunsmith in 1986, to arrange the re-chamber.
All three of my .375 Wbys are re-chambers.
It is about time I got a new barrel and have it chambered from scratch,
for the .375 Weatherby Magnum.
Maybe I will get one of those unusually fast ones that way.
All things .375 Weatherby and of that ilk welcome here.


Rip
.

I always enjoy your posts, RIP. This one was no different.

Very informative.

Thank you RIP

Thank you RIP so much for the data. We have a Rem XCR II in 375 Weatherby. So far we have only loaded 300g A-Frames and 350g Woodleigh PPs. Our data looks much like yours only not nearly so well organized

Yes thanks for the information. I have a M70 375 H&H that I've been considering a rechamber to the Weatherby round.

Thanks, all, I am having fun with this.

quote:

Originally posted by Cougarz:
Yes thanks for the information. I have a M70 375 H&H that I've been considering a rechamber to the Weatherby round.

Cougarz: Just do it, you won't be sorry.

A CZ 550 Magnum .375 H&H is good too.

Below are a couple of loads in my CZ .375 Wby.
The GSC bullets may require more powder for desired for speed,
compared to conventional bullets.

270-grain GSC FN and H4350, 25" barrel:





300-grain GSC FN and H4350, 25" barrel:





Rip
.

375 Wea, 300gr swift A-frame, 82gr H414, 2686fps
FN/Sako


100yds

I think the 375 Weatherby is a very under-rated round. I think the advent of the 378 Weatherby unfortunatley gave the 375 Bee guilt by association.
It's really nice in that you can shoot factory 375 H&H if you want to, but can also load 300g bullets to 2700 fps and 350g Woodleighs to 2500 fps as well. Ours is light and very accurate with both 375 H&H factory as well as our handloads.

quote:

Originally posted by chuck375:
I think the 375 Weatherby is a very under-rated round. I think the advent of the 378 Weatherby unfortunatley gave the 375 Bee guilt by association.

All true!

It's really nice in that you can shoot factory 375 H&H if you want to, but can also load 300g bullets to 2700 fps and 350g Woodleighs to 2500 fps as well. Ours is light and very accurate with both 375 H&H factory as well as our handloads.

Some say Roy conceived it in 1945, then killed it in 1953,
because it was so easy to just rechamber a .375 H&H to .375 WBY, he could not make money on it!

Weatherby brought it back in 2001.
It was standardized about then by C.I.P. with the new shorter throat.
I misspoke in the 2004 Reloading page, it is not SAAMI-ed, it is CIP-ed, and that throat length is .3700" of parallel-sided free-bore length,
and .3756" diameter of that PSFB.
If you include some other portions of the throat, like the bevel at the chamber's case mouth,
you might get 0.373" PSFB length like shown in the table below:







Anyway you measure it, it is about "a caliber of bullet in length" and "less than a thou" wider than bullet diameter,
as of about 2001.

Continuing with some QuickLOAD guidance,
here is the
300-grain Nosler Partition
and H4350
at COL of 3.580"
in a 24" barrel:
(I have found the 300-grain Sierra GameKing and the 300-grain Nosler Partition
to give almost identical results in handloads. I load them the same.
They fly through the air similarly when you pull the trigger.
On game, results might be terminally different.)



*********************************************************************************************
89.0 grains of H4350 is excessive with the 270-grain TSX, according to QuickLOAD:
*********************************************************************************************
270-grain Barnes TSX
and H4350
at COL of 3.580"
in a 24" barrel:



88.4 grains of H4350 might be the maximum with the 270-grain TSX,
and H4350 powder might be the best pick for that bullet.
Here is a powder selection table from QuickLOAD showing that,
but Reloder-17 sure looks good:



Take all of this with a grain of saltpeter,
based on specific lots of gunpowders, bullets, brass, and etc.
Some rifles are tight and some are loose.
Some take more, some take less.
Your mileage may vary.
Start low and work up, etc.


Rip
.

quote:

Originally posted by richj:
375 Wea, 300gr swift A-frame, 82gr H414, 2686fps
FN/Sako

richj,

Thanks for the addition of your data to the thread. Is that from a 24" barrel?

Remington early on tried to use the 300-grain Swift A-Frame in their "Premier" line of ammo for the .375 H&H.
At 2530 fps from a 24" barrel it pierced primers and caused difficult extraction.
They re-worked the load and it did about 100 fps slower after the re-call and re-issue.

So, your load beats the .375 H&H by about 250 fps, if from a 24" barrel.
About average for the .375 Wby "edge" across most bullet types and weights.
It does better with the heavier bullets than the lighter ones.

But it ain't bad at all with the 250-grain BarnesTTSX. That is a spiffy bullet in any .375,
even the .375/404 Jeffery Saeed,
which performs about like a .375 Weatherby,
except for the part about being able to use .375 H&H ammo in a pinch.


Rip
.

Thanks Bro Rip,
I have only used H4350 and 300 grain bullets. mine is a Sako AIII (Short Cocking piece cover), simply Rechambered.

i recently picked up 100 Barnes (or Barnes knock-off) BULlets in 300-grains. Like yours, my rifle is inherently accurate.

Thanks again

To deadibob, Bro'Dart, and other afficianados of the .375 H&H Improved:

I sort of got sidetracked by the .375/404 Jeffery Saeed of 2012, it does pretty good with 250 to 300 grainers.
But it is time for me to get back to the .375 Wby to challenge it with some light-bullet loads.
We know there are no flies on the .375 Wby with 300 to 350-grainers,
where it gets 200 to 300 fps better than the .375 H&H "Unimproved."
Y'all let me know what you think of the sub-300-grainers, please.

I will post some QuickLOAD data for the 270-grain TSX.
That is about as mean and tough a 270-grainer to be found.
That data ought to apply to just about any 270-grain bullet for a place to hang your hat.
The safe maximum H4350 QL will be shown along with a powder selection table (complete)
for the 270grTSX @ 3.580" COL in a 24" barrel.
A Universal sort of load.

After that I will post the QuickLOADs for the 250-grain TTSX @ 3.580" COL in both 24" and 26" barrels,
with complete powder selection table,
and with QuickLOAD data for the top three powders predicted:

RL-17
Win-760
H4350

Wait for it, it is coming,
in what size I do not know, as Imgur seems to be slowing down for me.
Maybe the more you use that free photo-hosting service, the slower it becomes.
Honeymoon over?

Rip
.

The powder selection table based on the same data as immediately above,
page 1:



page 2:



page 3:




Rip
.

Powder selection table for 250-grain TTSX @ 3.580" from a 26" barrel,
page 1:



page 2:



page 3:



Now the comparison of 24" barrel to 26" barrel with 250-grain TTSX
and the top three powders: RL-17, Win-760, and H4350:

RL-17, 24":



RL-17, 26":



Win-760, 24":



Win-760, 26":



H4350, 24":



H4350, 26":




Rip
.

My three musketjeers, .375 Weatherby Magnum Amigos:

I have had excellent results with simply re-chambering three factory .375 H&H barreled actions to .375 Wby:

24"-barreled Whitworth Mark X,
my first-ever "gunsmith-built" rifle,
1986-1987 Anchorage, AK.
The gunsmith was allergic to epoxy (Willis Fowler, may he R.I.P.) so I did the Brown Precision stock work on this one.
Had to be my first stock work!
The Ruger No.1 quarter rib for scout-scope base and fold-down rear open sight and pop-up peep (on rear Weaver base)
were there at birth of this rifle.
The EXTRA-Slot Weaver front base was 8x40-ed and JB Welded on later,
as was the floor-plate-latching-reinforcement, an 8x40 screw, stainless as an accent.
The forend tip swivel stud was the final, crowning touch:









Add the scout scope in Ruger rings and you have 4 sighting systems:
1. Peep and bead front sight.
2. Open rear sight and bead front.
3. 4x Leupold in 3 Weaver rings
4. Scout scope of choice:


**************************************************************************************************************************************
**************************************************************************************************************************************

24"-barreled Winchester M70 Classic Stainless in HS Precision stock bought off the shelf at Sportsman's Whorehouse in Lexington, KY:






**************************************************************************************************************************************
**************************************************************************************************************************************

25"-barreled CZ 550 Magnum in original Lux "Hogback" stock with two extra crossbolts and pillars added:




**************************************************************************************************************************************
**************************************************************************************************************************************

If I did a full blown custom ... ...
First thought: Lilja stainless, fluted, No. 6 sporter contour, 1:12" twist, 26" finished length.


Rip
.

RIP

I have some good news for you.
Barnes now has a 270 grain LRX with a BC of .449. Same tough bullet, better BC. At the moment these must be ordered by phone to Barnes, they aren't yet at the normal outlets.

'course, I just po' folk, my wife uses a 375 Ruger. And with a 20" barrel it won't quite reach the velocities of the Weatherby. But her rifle sure can shoot, and it will serve her well, too.

416Tanzan,

That is indeed great news, thanks.

LONG RANGE HUNTING
Barnes LRX bullets have been developed to match the advancements in rifle accuracy and extended-range optics. The LRX features a long profile and boattail design that delivers match-grade accuracy at long range with an incredibly high ballistic coefficient and terminal performance that delivers the quick, clean, ethical kills you’ve come to expect from Barnes.

NEW for 2017 in the LRX line we have added 3 new bullets. A 139 grain 7mm, 250 grain 338 and a 270 grain in 375. Watch for them to in stores by 9/15/2017.

http://www.barnesbullets.com/bullets/lrx/

Get a load of the .338-caliber offerings, up to 280-grainer with BC of .667

Me thinks a CZ 550 Magnum with a 26" Lilja barrel would be sweet.
Load those .375/270-grain LRXs long and go to town!


Rip
.

I live about 30 miles from the Barnes factory. I plan to try both the 270lrx and 250ttsx. I did find a lonely box of 260 accubonds in a store(can't find them anywhere online). The accubond has a b.c. of .473;

quote:

Get a load of the .338-caliber offerings, up to 280-grainer with BC of .667

Yes, those 280 grainers have been around for some time but the bullet is very long, 1.864", compared to 1.713" for the new 250grain.

The 280grainer may work in rifles with long 3.6 or 3.7" magazines, but for short standard-action 3.4" Rugers the 250grain looks about perfect. It should jjjust fit and still provide plenty of powder capacity in the WinMag for 2700fps. What is special is that this new .338" 250 grain bullet has a .602 BC. That is almost as good as the 280 grain bullet but it will probably be flying 150-200fps faster. So its wind drift may be as good or even better than the 280grain. The 250 LRX at 2700fps only drifts 9.3" at 400 yards and still has over 3000 ft# at 300 yards.

Its .313 sectional density means that it will penetrate far beyond most practical needs and can be used on a buffalo in a pinch.

OK---back to .375" talk.

quote:

Originally posted by deadibob:
I live about 30 miles from the Barnes factory. I plan to try both the 270lrx and 250ttsx. I did find a lonely box of 260 accubonds in a store(can't find them anywhere online). The accubond has a b.c. of .473;

deadibob,

Thanks for goading me into starting this thread.

What sort of .375 Wby rifle do you have?
Don't be shy.
I am easily impressed.

That is a promising situation being nextdoor to Barnes.
I cannot find the .375/270gr LRX at Midway USA, yet.

I reckon if you get to 2900 fps with the LRX 270-grainer, or 3000 fps with the TTSX 250-grainer,
That is getting close to fast enough.
See QuickLOAD predictions above.
I think they are good.
But the 270-grain LRX is 1.512" long
compared to 270-grain TSX's 1.372" length.
The LRX has only two grooves/cannelures on it,
but a quite long boat tail.
Bearing surface lengths of the two bullets might be similar enough to use the load data interchangeably for the two,
as long as you can seat the longer bullet to a longer COL, maybe?
I am going to have to try that myself, one of these days.
The CZ 550 Magnum box length of +3.8" could certainly handle that.

BTW, note that Saeed's Walterhog .375/300-grainer is about 1.520" long,
about the same length as the new LRX.
He uses a a COL of way longer than 3.6" for his .375/404J, he has to, with the long nose on that bullet.
He made it in his own image.


Rip
.

deadibob, love the RL 17 in my AI with both the 270TSX and the 250 TTSX. I gave up on Barnes ever producing ( I've been begging for years) a TTSX around 300 grains. Numerous phone calls and emails....ain't happening! Maybe while your there for your Bullets, you could "lean on them" a little for me!!!

I finally went with the 250 TTSX for the higher BC, for shooting longer ranges. But... I hate light bullets! I settled on a mv of 3130 fps from my 24" barrel (so says my chronograph). Not quite as accurate as the 270's, but pretty good.

Good Luck with your decision! memtb

RIP I had a Mark x in .375 weatherby but in a moment of foolishness I let it go. I do have a .375A.I. and I want to use it on the elk hunt here in a couple weeks. There is a thread here somewhere on my rifle. It is an A-bolt that was built and barreled by Malm of Salt Lake City who is now deceased. It came with 2 loads both of which are 300 grainers.

My Muzzleloader deer hunt here in Utah starts tomorrow so I'm not going to have much time to work up a load for it.

I just had my first hunting rifle that I bought at age 15 (mid-80s model 70 westerner) rebarreled to a 30-06A.I. I really am getting into these improved cartridges lately.

I've had really good luck in light-for-caliber Barnes bullets, so I would probably start with the 250ttsx and run it fast but accurately.

One thing I don't hear get mentioned about Barnes bullets, but my experience has been much less or no meat loss at all from bullet trauma/blood shot/bruised meat on entry or exit.Has anyone else experienced this or have I just gotten lucky?

deadibob,

Thanks for the reply.
Very well, when you get around to loading some Barnes bullets in the .375 AI, start low with the QuickLOADs above, your choice of powder.
We might learn something from your results.

Just to support my belief in the QuickLOAD data, here is a comparison of it to reality,
using the 250-gr Barnes TTSX-BT
in a cartridge very similar cartridge to the .375 Wby: The .375/404 Jeffery Saeed of 2012



That cartridge is my version of the .375/404J that is Saeed's baby.
It is reverse-engineered, and since he is keeping his throat "Cosmic Squirrel Secret,"
I chose to use the modern .375 Wby throat on my version.

Using the Norma-made .375 Wby brass with proper headstamp, case capacity (111.5 gr H2O) is only 3.6 grains smaller than that of the
.375/404JS-2012 (115.1 gr H2O).

Your mileage may vary, of course, if the .375 AI is throated differently,
if powder lot is different, etc.
So start at 10% below the maximum charges for the .375 Wby,
and who knows, you may do better than the QuickLOAD predicts.

Rip
.

quote:

Originally posted by deadibob:
I've had really good luck in light-for-caliber Barnes bullets, so I would probably start with the 250ttsx and run it fast but accurately.

I like the .375/250-gr TTSX-BT in the .375/404 JS-2012 for sure.
I wanted to be different with that cartridge than Saeed, who is stuck in a 300-grainer rut.

One thing I don't hear get mentioned about Barnes bullets, but my experience has been much less or no meat loss at all from bullet trauma/blood shot/bruised meat on entry or exit.Has anyone else experienced this or have I just gotten lucky?

Absolutely. I have had similar experiences with Barnes monometal copper bullets.
Sometimes NO MEAT DAMAGE AT ALL:
I once killed a fallow deer doe at 342 yards with one shot from a .416 Rigby Ruger No.1,
using the Barnes .416/350-grain X bullet at just over 2700 fps MV, an accuracy load.
I did not allow enough Tennessee Elevation,
but my Kentucky Windage was pretty good.
Hit her at the bottom edge of her ribcage.
Her abdomen unzipped and she was field-dressed by one bulet.
NO MEAT DAMAGE AT ALL.

Rip
.

Rip,

I may succumb to a rechamber. Is there a particular source for renting reamers you recommend? Besides my southpawed self, I don't think a .375 Wby will be very popular at my North Alabama smith.

Dieseltrucker,

Strangely enough, a central Kentucky smith had one when I pitched up at his shop in 2003.
He did 2 re-chambers for me back then, with the latest C.I.P. spec reamer made by Dave Manson.
He does not loan or rent his reamers, but it should be easy to find one the way he often does for oddballs.
The current C.I.P. standard.375 Weatherby Magnum is not an oddball.
Should be easy to rent one.

Here is how it is that the .375 Weatherby will clean up the .375 H&H chamber with no barrel setback required:



But the .375 RUM will not clean up a .375 H&H chamber, misses by enough to make the shoulder look funny, unless the barrel gets set back:




Rip
.

RIP,

Your a bad influence. Shame, Shame, Shame! Ordered a solid pilot reamer from Dave this AM. Backordered 4-6 weeks.

quote:

Originally posted by Dieseltrucker:
RIP,

Your a bad influence. Shame, Shame, Shame! Ordered a solid pilot reamer from Dave this AM. Backordered 4-6 weeks.

You won't be sorry.
So Dave and Dara didn't have that standard item on the shelf, eh?
4 to 6 weeks is the usual time it takes to make a brand new reamer whether CIP, SAAMI, or wildcat, and ship it to you.

Winchester M70, Whitworth Mk X, CZ 550 Magnum, Ruger RSM, Ruger No.1, Dakota, MRC, Sako, Kimber, Remington, or (God forbid!) Weatherby Mk V?
Just kidding, I really need a Weatherby Mk V DGR .375 WbyMag. Anything but a Blaser!


Rip
.

Rip,

We will be taking a factory MRC V2 .375HH to the lathe. I found a guy on gunbroker with these rifles several months back. Honestly, I was skeptical, mostly, of all the negative issues with QC and customer service at MRC. But CRF for a southpaw is a pretty limited field. As F. Lagard Smith says, "I couldn't help myself." Once home, I broke the barrel in and it is a fine little rifle! Shoots MOA with cheap Remington core-lokts and a bit better with my handloads.

Rip,

I was looking on the interwebs for the Bridger bullets in the above reference data. Where does one find such bullets?

It's a 24" barrel. It's now in a Hougue stock that has a RECOIL pad!! I think in the browning stock the barrel was floated.

quote:

Originally posted by RIP:

quote:

Originally posted by richj:
375 Wea, 300gr swift A-frame, 82gr H414, 2686fps
FN/Sako

richj,

Thanks for the addition of your data to the thread. Is that from a 24" barrel?

Remington early on tried to use the 300-grain Swift A-Frame in their "Premier" line of ammo for the .375 H&H.
At 2530 fps from a 24" barrel it pierced primers and caused difficult extraction.
They re-worked the load and it did about 100 fps slower after the re-call and re-issue.

So, your load beats the .375 H&H by about 250 fps, if from a 24" barrel.
About average for the .375 Wby "edge" across most bullet types and weights.
It does better with the heavier bullets than the lighter ones.

But it ain't bad at all with the 250-grain BarnesTTSX. That is a spiffy bullet in any .375,
even the .375/404 Jeffery Saeed,
which performs about like a .375 Weatherby,
except for the part about being able to use .375 H&H ammo in a pinch.


Rip
.

quote:

Originally posted by Dieseltrucker:
Rip,

I was looking on the interwebs for the Bridger bullest in the above reference data. Where does one find such bullets?

ARdotcom member fritz454, now deceased, was the maker of Bridger Bullets,
the most accurate bullets I ever shot in the .375 Weatherby Magnum.
R.I.P. John
Rip
.

Rip,

Got the rifle back from the smith yesterday evening. First thing I did was step outside, attach my magnetospeed and fire a couple rounds to see the velocity. The factory .375 H&H Remington 270 core-lokts came in at 2609. Book says 2690 for them. I then tried a factory Weatherby .375 Weatherby with 300 partitions. I got 2802 out of my 24 inch barrel. I am very pleased with speed and actually was expecting low to mid 2700s. I will take to range and shoot for accuracy hopefully this weekend. I am going to try Norma 204 as the go to powder for this one. 300 grain Barnes X and 300 Swift A-frame will be the softs. Cutting Edge brass 300 grainers for the solid. I will report once I have some qualitative data

Dieseltrucker,

2800 fps 300 grains in a .375Weatherby is probably right at max.

You're doing 5250 ft-pounds of muzzle energy. Doable, within some expectations, yet probably a reasonable max. Enjoy it.

Tarzan,

I agree. I do not know if it will give accuracy or if I will be able to get that velocity with my hand loads. But, I am, cautiously optimistic.

I looked at the Norma website and the accompanying reloading data. Most of the max N204 loads were 2740-2800. I would be tickled if I find accuracy in that velocity range.

If it works out, this rifle will go to Uganda in March, possibly as the main rifle.

2800fps with a 300gn copper bullet is what Saeed uses for most everything in his 375/404.

My wife is going to aim at a more modest load, maybe 2700-2750fps with only a 270gn LRX, the new Barnes release. Her 20" barrel 375Ruger makes for a nice handling rifle but it gives up about 100fps.

Tanzan, (frequently roaming about diagonally across Victoria, southeast from Uganda).

quote:

Originally posted by richj:
It's a 24" barrel. It's now in a Hougue stock that has a RECOIL pad!! I think in the browning stock the barrel was floated.

quote:

Originally posted by RIP:

quote:

Originally posted by richj:
375 Wea, 300gr swift A-frame, 82gr H414, 2686fps
FN/Sako

richj,

Thanks for the addition of your data to the thread. Is that from a 24" barrel?

Remington early on tried to use the 300-grain Swift A-Frame in their "Premier" line of ammo for the .375 H&H.
At 2530 fps from a 24" barrel it pierced primers and caused difficult extraction.
They re-worked the load and it did about 100 fps slower after the re-call and re-issue.

So, your load beats the .375 H&H by about 250 fps, if from a 24" barrel.
About average for the .375 Wby "edge" across most bullet types and weights.
It does better with the heavier bullets than the lighter ones.

But it ain't bad at all with the 250-grain BarnesTTSX. That is a spiffy bullet in any .375,
even the .375/404 Jeffery Saeed,
which performs about like a .375 Weatherby,
except for the part about being able to use .375 H&H ammo in a pinch.


Rip
.

Did not know that about the Remington/A-Frame loads. I had both them and the Federal 300 TSX and there absolutely was a recoil difference between the two. So much so, I thought the Federals were under-loaded. The Fed's shot better, but I always wondered why there was such a difference...now I know!

Are you hoarding load data RIP?