Woodleigh Bullet 375 Mag .375" 300gr Full Metal Jacket 46The most heavily constructed steel jacketed solids available. Made from extra deep drawing grade steel, clad with 90/10 gilding metal alloy. The jacket is heavy at the nose (0.084") to create extra impact resistance.The base of the bullet is rolled back 90 degrees to provide a double strength heel to prevent core loss on impact.