AmmunitionCartridges

.338-378 Wby. Mag.

Another Weatherby® wildcat, first introduced in the 1960s. 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.

.338-378 Weatherby® Magnum is available in Mark V® models: Accumark and Accumark RC.

20 cartridges per box.

This product is not eligible for overnight or 2-day shipping.

$159.00
CaliberWeight GrainsBullet TypeSuggested UsageB/CPrice 
.338-378 Wby.200AccubondMB.414$159.00Out of stock
.338-378 Wby.225Barnes TSXMB.482$159.00Out of stock
.338-378 Wby.250PartitionMB.473$159.00Out of stock

USAGE: V - Varmint; M - Medium Game (Deer, Sheep, Pronghorn, Black Bear); B - Big Game (Elk, Moose, Grizzly); A - African Big Game (Elephant, Cape Buffalo, Rhino, Lion)
BULLET TYPE: SP - Spire Point; Rn-EX - Round Nose-Expanding; FMJ - Full Metal Jacket; Barnes TSX - Barnes® TSX™; Barnes TTSX - Barnes® TTSX™; Partition - Nosler® Partition® Flat Base; BST - Nosler® Ballistic Tip®; Accubond - Nosler® Accubond®; Spitzer - Norma® Spitzer

Ballistics Specs PDF

Trajectory Comparison

.378 Wby.
Bullet B/C Path of Bullet
(Above or below line-of-sight of rifle scopes mounted 1.5" above bore)
Wt. Grains Bullet Type 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
270 SP .380 1.30 0.00 -6.10 -18.10 -37.10
270 Barnes TSX .326 1.30 0.00 -6.20 -17.90 -36.05
300 Rn-Ex .250 1.90 0.00 -9.00 -27.80 -60.00
300 FMJ .275 1.80 0.00 -8.60 -26.10 -55.40
.378 Wby
Bullet B/C Path of Bullet
(Above or below line-of-sight of rifle scopes mounted 1.5" above bore)
Wt. Grains Bullet Type 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds

Energy Comparison

.378 Wby.
Bullet B/C Energy (Foot-Pounds)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
270 SP .380 6062 5115 4295 3583 2968 2438
270 Barnes TSX .326 5615 4932 4319 3770 3276 2834
300 Rn-Ex .250 5699 4360 3283 2424 1764 1274
300 FMJ .275 5699 4470 3461 2640 1983 1476
.378 Wby
Bullet B/C Energy (Foot-Pounds)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds

Velocity Comparison

.378 Wby.
Bullet B/C Velocity (Feet per Second)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
270 SP .380 3180 2921 2677 2445 2225 2017
270 Barnes TSX .326 3060 2868 2684 2507 2337 2174
300 Rn-Ex .250 2925 2558 2220 1908 1627 1383
300 FMJ .275 2925 2591 2280 1991 1725 1489
.378 Wby
Bullet B/C Velocity (Feet per Second)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds

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