| This would have been copper, silver, or gold-not the modern base-metal alloys like cupronickel, aluminum-bronze, and copper-plated zinc. |
| Our armor-piercing bullet was made with a cupronickel jacket for the sake of the gun barrel. |
| As soon as the cupronickel jacket strikes the armor plate it splits and the lead core flattens out and flies into fragments. |
| On one side of the missile was a hole drilled through the cupronickel into one of the grooves of the serrated plug. |
| The tracer bullet consisted of a cupronickel shell, the nose of which contained a leaden core to balance the bullet properly. |
| In rifle and machine-gun bullets, a soft core of lead is encased in a harder jacket of steel or cupronickel. |
