Weatherby 338-378 Weatherby Magnum 225gr Barnes TTSX ammunition comes in a 20-round box (Weatherby part no. B333225TTSX) loaded for hunters shooting rifles chambered in 338-378 Weatherby Magnum. Weatherby lists this 225-grain load at 3180 fps and 5052 ft-lbs of muzzle energy, with a G1 ballistic coefficient of .514. The projectile is Weatherby’s Barnes TTSX bullet at 225 grains, and Weatherby lists the load as lead free. It is a straightforward choice when you want factory ammunition built around the Barnes TTSX rather than a handload.

Key Specifications

• Chambering is 338-378 Weatherby Magnum, the designation Weatherby lists for this load and the cartridge your rifle needs to be chambered for.
• Bullet weight is 225 grains, the weight Weatherby lists for this Barnes TTSX load.
• The bullet is the Barnes TTSX, the projectile Weatherby chose for this 338-378 Weatherby Magnum load.
• Each box holds 20 rounds, the full count that comes with this listing.
• Muzzle velocity is listed at 3180 fps, the starting point of Weatherby’s velocity table out to 500 yards.
• Muzzle energy is listed at 5052 ft-lbs, the figure Weatherby gives before the bullet starts shedding energy downrange.
• The G1 ballistic coefficient is .514, a measure of how well the bullet holds its velocity against drag.
• Weatherby lists this load as lead free, so the bullet is made without lead.
• Bullet diameter is .338-inch (8.6mm), the bore size this bullet is made for.
• Maximum case length is 2.913 inches, the cartridge dimension Weatherby lists for the 338-378 Weatherby Magnum.

Frequently Asked Questions

Is this load lead free? Yes. Weatherby lists this load as lead free.

What bullet does this 338-378 Weatherby Magnum load use? It uses a 225-grain Barnes TTSX bullet. Weatherby lists the bullet by name and weight for this load.

How many rounds are in the box? Each box holds 20 rounds of 338-378 Weatherby Magnum ammunition.

Buy the Weatherby 338-378 Weatherby Magnum 225gr Barnes TTSX Rifle Ammunition, 20-Round Box

Pick up a box of this Barnes TTSX load for your 338-378 Weatherby Magnum rifle and have it shipped fast from our Lubbock, Texas gun shop. You can also look through more Weatherby products and our ammunition department.