FIREARM BALLISTICS ACROSS 1. SIZE OF THE BULLET 2. IMPRESSIONS MADE WHEN BULLET IS RELEASED 3. WHERE THE BULLET ENTERS AFTER FIRING AND DIRECTS THE PROJECTILE 4. ALLOWS AIMING OF THE GUN 5. MARKS LEFT ON THE BASE OF THE CARTRIDGE AFTER FIRING 6. CREATED WHEN THE BULLET ENTERS THE FIRING CHAMBER 9. CONTROLS THE ACTION OF THE FIRING PIN 10. THIS STRIKES THE CARTRIDGE CAUSING A SMALL EXPLOSION TO IGNITE THE POWDER 1 1 . THE OPPOSITE FORCE ON A GUN CAUSED BY FIRING 12. CREATED BY THE EXPANSION OF THE CARTRIDGE IN THE CHAMBER 13. SCRATCHES MADE AS THE CARTRIDGE MOVES IN FIRING CHAMBER DOWN 1. USED TO MATCH BULLETS AND CASINGS 7. GROOVE PATTERN ON THE INTERIOR OF A BARREL 8. WHERE THE EXPLOSION OCCURS TO PROPEL THE BULLET