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The 30-378 Weatherby Magnum is a legitimate extreme-range powerhouse. Developed in the late 1950s at the request of the U.S. Army, it spent decades as a wildcat before Weatherby brought it to production in 1996. What you're getting here is the fastest production .30 caliber ever built, capable of delivering magnum-grade terminal performance at distances where most other cartridges have already lost their effectiveness.
This particular load uses Weatherby's Hammer Custom bullet, a solid copper projectile turned on a CNC lathe for precision. Each bullet gets weighed and micrometer-measured during production, so consistency is built in from the start. The hollow point design initiates expansion immediately on impact, shedding petals while the remaining shank stays intact to create a devastating wound channel. That combination of fast expansion and deep penetration is what separates these rounds from typical lead-core hunting bullets.
At 3225 fps, the 195-grain Hammer Custom generates serious velocity while maintaining a high ballistic coefficient. You're looking at the kind of energy and trajectory that keeps big game vulnerable well past 300 yards for elk and moose, and effective on mule deer and similar-sized game past 400 yards. The flat shooting profile is where this cartridge really shines at extreme distances. Whether you're hunting across canyon country or setting up for 1000-yard precision, the 30-378 WBY delivers energy downrange that lesser .30 calibers simply can't match.
Hammer bullets aren't the traditional cup-and-core design. The solid copper construction combined with that micrometer-measured precision means shot-to-shot consistency you can count on. Weatherby loads this ammunition to exacting standards, so you get the same velocity and point of impact from round one through round twenty. That consistency matters when you're building a load strategy for long-range work.
This is for people who understand that velocity and precision aren't overkill for what they're hunting. It's premium ammunition that delivers on the promise.
The 30-378 WBY Magnum is chambered in Weatherby Mark V rifles and other precision bolt-action rifles specifically built for the cartridge. Most common are the Weatherby Mark V Deluxe and Weatherby Mark V Ultra Lightweight models. Before purchasing ammunition, verify that your rifle is actually chambered for the 30-378 WBY Magnum, as the large magnum case and high pressures require a properly designed receiver.
The 30-378 WBY Magnum is the fastest .30 caliber cartridge in production. It outpaces the .300 Weatherby Magnum, .300 Winchester Magnum, and .300 Remington Ultra Magnum in terms of velocity, particularly with heavier bullets in the 180-200 grain range. The tradeoff is significant recoil, barrel wear that comes with extreme velocities, and ammunition costs that run higher than standard magnum offerings.
Hammer Custom bullets deliver two key advantages: reliable expansion at long-range velocities where lead-core bullets sometimes fail to open, and a consistent wound channel due to the solid copper construction with controlled petaling. Each Hammer bullet is individually measured during manufacturing, which means the load-to-load consistency is tighter than traditional ammunition. That precision matters when you're setting up for extreme-distance hunting or competitive long-range shooting.
The 30-378 WBY is specifically built for long-range hunting. With the flat trajectory and energy retention of the Hammer Custom 195-grain load, you can effectively hunt elk and moose well past 300 yards, and mule deer and similar game past 400 yards. It's overkill for close-range hunting, but for shots beyond 400 yards where wind and distance demand premium ballistics, this cartridge delivers.
| UPC | 747115449422 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | M303195HCB |
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