Weatherby .30-378 Weatherby Magnum ammunition (part no. H303180IL) loads a 180-grain InterLock for hunters who want dependable performance in the field. Weatherby built its name on high-velocity magnum cartridges, and its factory ammunition is loaded to the same demanding standard as its rifles. An internal locking ring mechanically bonds the jacket to the core so the bullet mushrooms without separating, even after passing through bone. Brass-cased and 20 to a box, it is built to feed reliably through bolt guns and semi-autos chambered for the cartridge. In our rifle ammunition lineup, this .30-378 Weatherby Magnum loading is a dependable choice worth adding to the cart.

Key Specifications

• The chambering is .30-378 Weatherby Magnum, one of the largest .30-caliber cartridges made, built for extreme velocity and long-range energy.
• The bullet weighs 180 grains, setting the balance of velocity and downrange energy this load is tuned for.
• The bullet is a InterLock, the projectile Weatherby chose to load behind .30-378 Weatherby Magnum.
• An internal locking ring mechanically bonds the jacket to the core so the bullet mushrooms without separating, even after passing through bone.
• Cases are Brass, holding pressure reliably and staying reloadable for handloaders.
• Each box holds 20 rounds, enough to confirm zero and still have rounds on hand.
• A case ships 10 boxes (200 rounds total), ideal for stocking up or buying once for the season.
• At about $4.42 per round, the price reflects the bullet construction loaded into this round.

Frequently Asked Questions

What game is the 180-gr InterLock suited for? With .30-378 Weatherby Magnum behind a InterLock bullet, it is built for deer-class game and similarly sized animals within the cartridge’s normal hunting range.

How many rounds come in a case? A case ships 10 boxes of 20, 200 rounds total.

How is the InterLock different from a standard cup-and-core bullet? An internal locking ring mechanically bonds the jacket to the core so the bullet mushrooms without separating, even after passing through bone.

Buy the Weatherby .30-378 Weatherby Magnum 180 gr InterLock

A solid zero and dependable ammunition matter more than anything else when it counts, and this InterLock loading is built to be the round you don’t have to think twice about. Stock up before the next range day or hunt. Order from our Lubbock, Texas gun shop and it ships fast to your door.