Looked back at the _.375 Wby file_.

That 92 grain load of MRP with 300 grain Sierra GameKing was sub MOA at 100 yards for three shots. It is a 100% load in Hornady basic brass. There would be room to spare in the Weatherby/Norma brass, and there would be a velocity about like the Factory ammo, or about 2740 fps in my 24" barrel.

The Nosler Partition and Sierra GameKing of 300 grains have been interchangeable in loads for me before, both give about the same velocities/pressures for a given charge.

My prediction for an excellent load to duplicate the .375 Weatherby factory ammo:

300 grain Nosler Partition
Weatherby/Norma brass
Norma MRP powder 92.0 grains
Federal GM215M primer
Seat to COL of 3.600" max, or wherever the crimp cannelure dictates.

My handload gives sub-MOA instead of the plus-MOA of the factory stuff.

Approximate velocity will be 2740 fps in a 24" barrel or 2800 fps in a 26" barrel.

Of course your mileage may vary, as may your rifle and lot of powder. Work up from below, etc.

For 300 grainers, it is a toss up for me between H4350 and MRP.

For 350 grainers, MRP is the clear favorite. It will easily give 2600 fps in a 26" barrel. At least 2540 fps in a 24" barrel. Somewhere around 89 to 90 grains of MRP.

So that about sums it up for me.

The .375 Weatherby will do with 350 grainers what the .375 H&H
can do with 300 grainers.

As fast as you can push the .375 H&H with 300 grainers, that same rifle rechambered to .375 Weatherby will do the same speed with 350 grainers.

Or it can do classic .375 H&H at really low pressures.

And the longer monometal copper 270 to 300 grain bullets will definitely deliver the mail with less pressure in a .375 Wby.

It is a close second to the .375/404 or .375 RUM in that regard, but you can still shoot factory .375 H&H to good effect in a pinch if ammo supply problems arise.

Ron,

Those 350s are moving along. I wonder how many buffalo someone would have to shoot to seem some sort of difference between that and 416 Remington.

Is this behind your interest in Wby DGR with drop magazine?

The obvious advantage of course over the 375 RUM is the 375 H&H ammo/brass. It is interesting that is does the velocities with 300 grainers that Saeed seems to have settled on his 375/404s.

Mike

quote:

---

Originally posted by Mike375:
Ron,

Those 350s are moving along. I wonder how many buffalo someone would have to shoot to seem some sort of difference between that and 416 Remington.

Is this behind your interest in Wby DGR with drop magazine?

The obvious advantage of course over the 375 RUM is the 375 H&H ammo/brass. It is interesting that is does the velocities with 300 grainers that Saeed seems to have settled on his 375/404s.

Mike

---

Really, just being able to get to 2700 fps in a 24" barrel with the long monometal softs and solids of 300 grains is where it is at for me.

I have a sentimental attachment to the .375 Wby, since it was my first venture into rifle loonery, in 1986, when I had Mr. Willis Fowler of Anchorage, Alaska rechamber a Whitworth Mark X with the old long freebore reamer.

The new chamber by Weatherby is better. But the old one could do all that the .375 H&H could do, and more, so it has never been too shabby.

It is no doubt a great cartridge now, with 0.3700" freebore and 1 degree 2 minute leade.

And heck yeah, I would take a Mark V buffalo hunting just to watch the reactions on the faces of PH's I encountered along the way.
The Mark V DGR in .375 Weatherby does have a 3.75"/3.8" box doesn't it? If so, I could seat those monometals long and do it all "more better."

And heck yeah, I would take a Mark V buffalo hunting just to watch the reactions on the faces of PH's I encountered along the way.

Don't mention that to 500 Grains because I think he is on a Remington thread at the moment. Could be stroke material.

I don't think I can recall a Mark V failing to feed, even the staggered magazine models.

Actually, if AR is any guide the main problem with CRF seems to be getting the cartridge from the magazine into the chamber, unless D'Arcy Echols or similar has had the rifle.

Mike

Just saw the last part your post.

I will check when I ring and follow by email to Kevin in case the drop box makes any difference.

Mike

RIP-
My notes indicate I am getting about 2735fps with the 300gr bullets over a stiff charge of R19...so I'm at the top of what I can expect from a 24" barrel.
This delivers just what I had hoped for before starting down this road...something that will offer a heavier bullet at H&H velocity, and allow the firing of std. H&H ammo if necessary. Of course, the ability to use 300grs or a 270gr TSX Barnes at much higher velocity has my interest as well.
In the end, I see the 375Wby as a very practical rifle to own. Is it any better than a 375H&H or a 416Rem? No, but it can do what either of them can better than either of them are able to..when taken out of their primary roles.

Yes sirree! Couldn't agree more. Well said John S. Thanks.

Finnaly got a password back so I can throw in my 2 cents ......very interesting thread......

I rechambered a M-70 to .375 Weatherby and personnaly , I find it to be a better reloader's cartridge than the H&H version . I've had 2 different H&H chambered rifles and I found it somewhat difficult to reach the muzzle speeds claimed by a number of folks . This with all the usual powders preferred for the Holland. I am mostly interested in the lighter bullets , and with my Whitworth , the upper limit for 260 to 270 gr bullets is about the normal factory level of 2700 fps . This with RL 15 and several other powders or you will soon run into sticky extraction . With the Winchester, before re-chambering , you could reach the 2800 fps level with heavily compressed loads of somewhat slower powders like H414 or H4350 . With RL15 , 4320 , and the like , you simply reached a point where the addition of more powder did not increase velocity and extraction got progressively tougher , as well as plenty of case stretching.

Chambering to the Weatherby version made a world of difference , 2800 is like falling off a log and 2900 to 2950 is easy , this with nice extraction and little case stretch .H4350 and RL19 both work very well , and the H4350 extreme has always gotten me more speed than IMR . So , while I grant you 2800 with 270 grainers can be done with the H&H , it is done much easier with the Weatherby . I also tried the new Ramshot Hunter and it may be the perfect powder for the Weatherby , with 3000 fps from a 260 gr Accubond now realisitc......

The Weatherby factory loads really perform in my rifle , delivering about 2780 fps with the chrono set 20 ft out. I think this would figure very close to the claimed 2800 fps muzzle speed , this of course in the 24 inch Winchester barrel . I pulled a couple of bullets and wouldn't ya know , it is 92 grains of a Reloader or Norma looking powder : i figured likely RL19 at the speed I am getting...

In short , I am not one bit sorry I re-chambered , and I believe the Weatherby may be about the perfect .375 from a rifle enthusiast's standpoint . And , I'd encourage anyone with a Weatherby or other improved .375 to give Ramshot Hunter a try........

sdgunslinger,
Cheers!

Mike375,
I thought H&H closed the Paris shop last year. It may be that the web site hasn't yet reflected this.

Wink,

You could well be right because my knowledge is limited to the web page.

Mike

Mike: I think I'm going to hold out for a custom in 375 WBY in the future. Maybe not as "done up" as a Crown Custom, but maybe along the lines of the old Ultramark. jorge

jorge,

I think to duplicate the Ultramark you would need to go via Build a Custom Gun so as to pick up the wood upgrade. I expect to be talking to Kevin Nunes Wednesday your time.

By the way, if you duplicated a Deluxe via Build a Custom Gun the cost would probably be close to the Crown Custom.

Now lets be honest, you are just not tarty enough to be seen with a Crown Custom

I have seen a couple of the standard Crown Customs and a Royal Custom and they are really only tarted up Deluxes. If you did a Crown Custom via Build a Custom Gun with the top wood uograde and the higher quality engraving you would double the price. For example, Crown engraving on the scope rings is from memory $295US but the Grade 111 engraving is $695US

I think for similar money I would prefer a Deluxe done via the Build a Custom Gun and commence with the Kreiger cut rifle barrel option than buy a standard Crown Custom.

Mike

Oh yes I am! actually the Crown custom pictured on their website is acceptable to me. It retails here for 7500 US, but I wonder how much it wholesales for? Regardless, it's not in my immediate future. jorge

Back to what started this thread, too bad the standard Mark V is not chambered in .375 Wby, the most wonderful old War Horse of a cartridge that is the only one in the world that is more versatile than a .375 H&H.

Damn those bean counters!

I have a book on my nightstand that is in my reading on-deck circle that addresses that very topic. It is titled "The Flight From Science and Reason".
The good news is you can borrow my reamer when you get ready to build another one.

lawndart

quote:

---

Originally posted by lawndart:
I have a book on my nightstand that is in my reading on-deck circle that addresses that very topic. It is titled "The Flight From Science and Reason".
The good news is you can borrow my reamer when you get ready to build another one.

lawndart

---

lawndart,
Good on you!
Thanks anyway, but my smith ordered one from Dave Manson and has only done two rifles for me with it so far.

Funny how he usually lets me buy the reamer and keep it, or he just rents one.

With the .375 Wby "new" reamer, he eagerly bought the reamer and kept it for himself. It is standing by.

Cheers!

Jorge,

I just heard from the Wby agents out here that Crown Customs are going to drop 1/3 in price. The main bloke was not there but this fellow was fairly sure and told me to hold ordering from Wby what I was going to order.

Whether this is to do only with Australia I don't know and/or what effect it would have on other Wby prices.

The current retail price of a Crown Custom (as per the catolugue picture) in Australia is in the same proprortion to a standard Deluxe as it is in America.

Mike