![Weatherby Select Plus .30-378 WTHBY MAGNUM, 180gr, Interlock - 20 Rounds [MPN: H303180IL]](https://cdn11.bigcommerce.com/s-7mtx86wogv/images/stencil/100x100/products/320823/3717091/32788440__44911.1.png "Weatherby Select Plus .30-378 WTHBY MAGNUM, 180gr, Interlock - 20 Rounds [MPN: H303180IL]")
![Nosler Trophy Grade Long Range .30-378 WTHBY MAGNUM, 210gr, Spitzer Accubond LR - 20 Rounds [MPN: 60133]](https://cdn11.bigcommerce.com/s-7mtx86wogv/images/stencil/100x100/products/320794/3717072/32830363__61776.1.png "Nosler Trophy Grade Long Range .30-378 WTHBY MAGNUM, 210gr, Spitzer Accubond LR - 20 Rounds [MPN: 60133]")
))/2353713.json?$BPSMkt_ProductFeeds$&extend=380,380,380,380 "Nosler Trophy Grade .30-378 Weatherby Magnum 210 Grain Centerfire Rifle Ammo")
))/2353713.json "Nosler Trophy Grade .30-378 Weatherby Magnum 210 Grain Centerfire Rifle Ammo")
![Weatherby Select Plus .30-378 WTHBY MAGNUM, 195gr, SCHP - 20 Rounds [MPN: M303195HCB]](https://cdn11.bigcommerce.com/s-7mtx86wogv/images/stencil/100x100/products/368585/3720616/1.1667240607800__04151.1.jpg "Weatherby Select Plus .30-378 WTHBY MAGNUM, 195gr, SCHP - 20 Rounds [MPN: M303195HCB]")
![Weatherby .30-378 WTHBY MAGNUM, 220gr, ELD-X - 20 Rounds [MPN: H303220ELDX]](https://cdn11.bigcommerce.com/s-7mtx86wogv/images/stencil/100x100/products/372722/3717093/32744202__74291.1.png "Weatherby .30-378 WTHBY MAGNUM, 220gr, ELD-X - 20 Rounds [MPN: H303220ELDX]")
30-378 Wby Mag
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The .30-378 ammo Weatherby Magnum is a .30 caliber, belted bottle-necked rifle cartridge. The cartridge was developed in response to a US Army military contract in 1959.
The .30-378 was originally designed by Roy Weatherby as an anti-personnel / anti-materiel military cartridge for a government contract. The .30-378 Weatherby Magnum is one of the most accurate rifle cartridges.
The .30-378 Weatherby Magnum utilizes the .378 Weatherby Magnum as a parent cartridge. The .378 Weatherby case was necked down to accept a .30 caliber (7.62 mm) bullet while preserving the double radii shoulder of the parent case.
