Lapua 30 Caliber Rifle Bullets 170 Grain Lock Base FMJBT 1000 Bullets. This rifle bullet is suitable for mid-range and long range shooting and it has proven its worth in sport shooting arenas as well as military and law enforcement applications over time. The B476 Lock Base projectile weighs 170 grains / 11 grams and is suitable for caliber .308 (7.62mm). Specifications for Lapua 30 Caliber Rifle Bullets 170 Grain Lock Base FMJBT: Manufacturer: Lapua Bullet Type: Full Metal Jacket Boat Tail (FMJBT) Caliber: .30 Carbine Bullet Weight: 170 grain Package Contents: Lapua 30 Caliber Rifle Bullets 170 Grain Lock Base FMJBT Lapua 4HL7086: 30 Caliber Rifle Bullets 170 Grain Lock Base FMJBT 1000 Bullets