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use .375 H&H with .375 Wby rifle? (12 posts)

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Posted 05/16/201205:45 PM

> Can you fire (safely) .375H&H thru a Wby. Mark V rifle chambered for .375 Wby. magnum?

> Can you use .375H&H brass to reload for the .340 Wby. Magnum?
 Undecided
Joined: 04/19/12
Posts: 25

Posted 05/16/201206:00 PM

Yes you can safely fire 375 H&H in a 375Wby, with a slight loss in performance. Not only is that good if the airline loses your ammo on route to Africa, you also end up with fire formed brass for reloading to 375Wby.

As far as reforming an H&H into a 340 I have no experience in that area.

Jamesexhale and squeeze
Joined: 04/23/09
Posts: 2438
james7mmwby

Posted 05/16/201207:10 PM

Correct. I have formed almost all my brass for the 375 Weatherby by firing 375 H&H. You could make 340 Weatherby cases out of 375 H&H but it would be more work.
Joined: 09/07/07
Posts: 468
257 Shooter

Posted 05/16/201211:30 PM

Although it is taking a while and I'm in no rush, the notion of getting a 375 Wby is made easier since the 375 H&H ammo can be fired in a 375 Wby. I'm sure that IF I go somewhere with the 375 Wby and the ammo is lost, I could turn to the H&H ammo and go to the field.

A retired teacher friend of mine was going to get a 375 H&H but instead got a 375 Ruger. I know the price of the Ruger-chambered rifle was much lower than the H&H chambering he was considering. He's going to use the 375 on water buffalo in Australia and I think cape buffalo in Africa. He's not going to be able to use any other 375 chambering besides the Ruger. However, if he got the H&H, there is a great chance the stores there have ammo for him. World wide ammo supply is a good thing.Of all the gin joints in all the towns in all the world, she walks into mine.







Joined: 01/21/09
Posts: 1663

Posted 05/17/201208:57 AM

Is there any "downside" to getting a Wby rifle in .375 Wby. vs in .375 H&H?
Do the H&H cartridges fit snug or what?
Joined: 04/19/12
Posts: 25

Posted 05/17/201206:41 PM

Well, the downside is the 375 Weatherby prefers to be fed 375 Weatherby ammunition. 375 Weatherby ammo and brass are generally more expensive and harder to come by. The upside is the 375 Weatherby can generate a bit more velocity than the 375 H&H.
Joined: 09/07/07
Posts: 468
257 Shooter

Posted 05/22/201206:25 PM

Well, the downside is the 375 Weatherby prefers to be fed 375 Weatherby ammunition. 375 Weatherby ammo and brass are generally more expensive and harder to come by. The upside is the 375 Weatherby can generate a bit more velocity than the 375 H&H.

Yes, but you can shoot the .375 H&H as much as you want, correct...and all the while "fire-forming" the H&H brass to .375 Wby., so when you want to reload for it, you have brass for .375 Wby. without having to spend for .375 Wby. factory ammo?
Does ANYBODY know how much of a loss there is shooting the .375 H&H in the 375 Wby, and WHY?
Is it the "fit"?
Joined: 04/19/12
Posts: 25

Posted 05/22/201206:58 PM

Absolutely right.

It is however, hard to determine the velocity difference firing the 375 H&H in the 375 Weatherby vs 375 H&H. You have to fire specific 375 H&H loads in a rifle chambered for 375 H&H and get velocity data. You then rechamber the same rifle with the same barrel to 375 Weatherby and fire the same 375 H&H load in the new chamber under the same conditions and observe the difference. If I remember correctly, there was less than a 50 fps loss firing the 375 H&H after rechambering. This is not a scientific conclusion though.

I didn't shoot much 375 H&H in that chambering because my original intent in buying the rifle was to chamber it for 375 Weatherby. I started fireforming right away. I only fired it as a 375 H&H to make sure the rifle had accuracy potential before spending time and money on the rechambering. I would speculate any velocity loss is due to the larger chamber volume and less chamber pressure. I know the difference is not great.


Hopefully this helps. Good luck.
Joined: 09/07/07
Posts: 468
257 Shooter

Posted 05/22/201207:03 PM

Ditto to the previous comments.

I've read them all before in various places and have no reason to doubt any of them. Of all the gin joints in all the towns in all the world, she walks into mine.







Joined: 01/21/09
Posts: 1663

Posted 05/22/201207:05 PM

16n69,

This from Hdy manual # 7,

375 H&H with 300g IB bullet with 66.8g H-4895 @ 2500fps
375 Wby with 300g IB bullet with 72.3g H-4895 @ 2600fps

So there's your answer case capacity, the wby case has more.

The 375 Wby is an improved version of the H&H, the case heads both measure .532" the case length is 2.850 for the H&H and 2.860 for the Wby. The rest of the dimensions are different but so close that firing the H&H in the Wby is safe and results in a nicely fire formed case. Hope this helps, others more knowledgeable than me may have more to say.

Good shooting to you,

jamesexhale and squeeze
Joined: 04/23/09
Posts: 2438
james7mmwby

Posted 05/23/201204:33 PM

Ya know...I have to say, in my short time here, @ Weatherby Nation I have observed that there is FAR less thread & post "bashing / flaming" here than on most other forums. Good quality input & answers...guess it reflects the quality of the firearms and those who buy & use them?

Thanks for the info...I really cannot any longer, see any reason to get the Mark V Custom Shop DG Rifle in just .375H&H, when I can have BOTH .375H&H & .375 Wby in one gun?
 Cool
Joined: 04/19/12
Posts: 25

Posted 05/23/201209:41 PM

16n69,

We all here for the same reason, love of Wby's , hunting, shooting and guns in general. I noticed a typo on my previous post, both bullet weights are supposed to read 300g, I corrected it. By the way i almost pulled the trigger on a 375Wby but caved when I saw the Sako 85 375 H&H my dealer had in stock, I love my 375, but since it isn't a Wby I will just have to get another B down the road in a new to me Wby caliber.

Jamesexhale and squeeze
Joined: 04/23/09
Posts: 2438
james7mmwby

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