The Lapua .338 Lapua Magnum 250 gr Lock Base FMJBT (Lapua part no. 4318033) is a .338 Lapua Magnum factory-loaded cartridge with a 250 grain Lock Base FMJBT bullet. Lapua lists it as tactical ammunition and says the bullet stays supersonic out to 1,300 meters. This listing is a 10-round box.

Key Specifications

• Caliber is .338 Lapua Magnum.
• Bullet weight is 250 grains.
• Bullet type is FMJBT (Full Metal Jacket Boat Tail).
• Ballistic coefficient is 0.625 G1 and 0.310 G7, which Lapua lists for downrange drag.
• Twist rate is 1 in 12 inches as listed by Lapua.
• Purpose is tactical use, according to Lapua.
• Each box holds 10 rounds.

Frequently Asked Questions

What bullet does it use? It uses Lapua’s Lock Base bullet, a full metal jacket boat tail design with a 0.625 G1 ballistic coefficient.

How far does it stay supersonic? Lapua says the Lock Base FMJBT bullet remains supersonic up to 1300 meters.

Buy the Lapua .338 Lapua Magnum 250 gr Lock Base FMJBT

Lapua’s Lock Base FMJBT is the full metal jacket tactical load for the .338 Lapua Magnum. Find more in our rifle ammunition selection at our Lubbock, Texas gun shop.