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.338-378 Weatherby Magnum
 
 

Another Weatherby wildcat, first introduced in the 1960s. It started out as the 338-378 Keith/Thompson, a pure wildcat developed my Mr. Thompson and Elmer Keith. It is based on the 378 Weatherby case shortened to 2.5 inches. This is the ultimate cartridge for long-range, big game hunting. Delivers more than 5,000 foot pounds of energy at the muzzle with a .338-sized bullet. Extremely powerful and flat-shooting. Based upon the .378 case, necked down to .338. Reintroduced as a Weatherby production cartridge in 1998. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.

   
 
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There is no printed reloading manual created for this caliber. There will be created a Wire-O booklet of all calibers with at least 60 loads present.
Click here to see in which calibers this reloading manual is available.

 

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With a subscription you can download all loads in .338-378 Weatherby Magnum as a PDF load manual. On top of that you will also get unlimited access to downloadable PDF manuals in several hudred calibers.

 


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reloadersnest Complete Reloading Manual
The Complete Reloading Manual is a compilation based on all rifle calibers with at least one load from this site.
The book contains 311 calibers and 9557 loads. 549 pages in 8x5 inch Perfect-Bound binding.
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Show all 6 loads

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Not yet verified user loads  
ID: Bullet weight: Bullet name: Powder:  
250 grs
Swift A- Frame
Hodgdon US869
250 grs
Barnes TSX
RL22
180 grs
Nosler Accubond
H1000
250 grs
Sierra Game King
H4831
250 grs
Nosler Partition Gold Cup
Alliant reloader 25
225 grs
Hornady Interbond
Alliant RL25
250 grs
Sierra Matchking
Ratumbo
215 grs
SIERRA GAME KING
IMR7828 SSC
180 grs
Nosler Balistic Tip
IMR 7828
225 grs
Acccubond
Retumbo
225 grs
Nosler Accubond
Retumbo
225 grs
HORNADAY SST
R33
300 grs
berger otm
H1000
300 grs
SMK
RL 33
 
   
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