Introduced with the Gun Runners' Arsenal add-on, match ammunition is precision-made so that every bullet has the same powder, shape, and weight. This ammunition is usually much cheaper than regular ammunition and comes in bulk packaging. The resulting product is a slightly more damaging round at the cost of more regular maintenance on a firearm due to the damaging corrosive materials used in the round's construction. Surplus ammunition is poor-grade ammunition made in large quantities by using corrosive materials in their construction. However, this also means they break up when they hit things like armor plates, drastically reducing the weapon's penetrating power.
Hollowpoint bullets mushroom and break upon impact, causing massive trauma on fleshy, un-armored targets. Due to the high muzzle velocity and penetrative properties of the round, damage to the target is slightly reduced.
For this purpose, they have a greatly strengthened case with a specially hardened and shaped nose.
Armor-piercing rounds are designed for punching through armor plating.