Lapua’s Lock Base bullet is a Lapua innovation which combines a full metal jacket and boat tail with a patented base design. 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).