5mm Round (Fallout: New Vegas)

The 5mm round is a type of ammunition in Fallout: New Vegas.

Characteristics
5mm is traditionally belt-fed, and is available in rather high quantities, something made necessary by the notably large "magazine" sizes on the weapons that use it. For example, the minigun loads 240 rounds at one time and fires an exceptional rate, requiring that the player carries a huge supply if they intend to rely on miniguns.

Weapons using this ammunition

 * Minigun
 * Assault carbine
 * CZ57 Avenger

5mm, Armor Piercing
Armor-piercing rounds are designed for punching through armor plating, so they have a strengthened case with a specially hardened and shaped nose. Due to the high muzzle velocity and penetrating properties of the round, damage to the target is slightly reduced. They are more common and can be purchased in larger numbers than any other type of AP rounds in game. As of patch 1.3.0.452 they now have an armor piercing effect of -25 DT, by far the largest armor piercing effect of any ammunition found in the game and can even effectively penetrate T-51b power armor.

5mm, Hollow Point
Hollow point bullets mushroom out upon impact, tearing through fabric, flesh and organs creating a larger wound cavity. However, hollow points lack the penetrating power to punch through denser materials, this means they cannot pierce things like armor plate, drastically reducing the weapon's penetrating power. 5mm HP rounds are very rare in the Mojave, sold in very small amounts by some vendors.

5mm, Surplus
Surplus ammunition is poor grade ammunition made in larger quantities by using corrosive materials in their construction. The resulting product is a slightly more damaging round but at the cost of more regular maintenance on a firearm due to the highly damaging corrosive materials used in the round's construction. However, because they are used by most militaries, the bullet is designed to be more damaging. Since weapons equipped by companions do not lose durability for firing, the surplus ammunition is best used there.

Notable locations
Both standard and armor piercing rounds are sold in large quantities by Gun Runners.