Mercury Tipped Bullet - This is the reason. The idea was, to put mercury into a bullet, then seal the tip with a drop of molten lead. Supposedly, when the bullet hit flesh and decelerated, the mercury would keep going. The problem in designing a mercury filled bullet is to fill the hollowed cavity of the bullet with mecury without pockets as the mercury hardens almost immediately. Mercury tipped rounds have a channel drilled in them that is filled with mercury, then capped. When the bullet hits a target, the round literally explodes as the mercury is. Tipped bullets are more aerodynamic, resulting in a higher ballistic coefficient. In the scene the character drilled deep into the led part of the bullet. He then took a bottle of mercury and put a couple drops into the hole he drilled, then he laid 3 pieces of what looked. Are you considering using tipped bullets? On the same token, i have heard that using bullets tipped with mercury will explode on impact, causing worse wounds.
This is the reason. The idea was, to put mercury into a bullet, then seal the tip with a drop of molten lead. Supposedly, when the bullet hit flesh and decelerated, the mercury would keep going. The problem in designing a mercury filled bullet is to fill the hollowed cavity of the bullet with mecury without pockets as the mercury hardens almost immediately. Mercury tipped rounds have a channel drilled in them that is filled with mercury, then capped. When the bullet hits a target, the round literally explodes as the mercury is.