20 Gauge Round

 is a type of ammunition in Fallout: New Vegas.

Characteristics
20-gauge shotgun shells are very similar to their better known cousin, the 12 gauge shotgun shells. 20-gauge shells are a plastic tube with a brass base. The primer, gun powder, and wadding are compressed into the bottom of the casing and the projectiles are place on top, held by the plastic tubing. Most common projectiles are small lead or steel balls called shot. Being smaller than 12-gauge shells (smaller numbers mean bigger in "gauge" speak) 20-gauge shells include less powder and less shot. The benefit the the smaller shell size is less "kick" when fired.

20 Gauge, Magnum
Magnum Shells are standard Buckshot shells fitted with a higher internal powder load, increasing velocity and stopping power. The downside is more damage done to a firearm due to the higher overall pressure, resulting in more regular maintenance.

20 Gauge, Slug
Slugs are typically a large lead round with rifled grooves on the bullet to enable it to spin in flight, promoting better accuracy over a distance. Slugs enable a shotgun to engage targets are a further distance and are commonly used to shoot large animals for it's massive stopping power.

Used in

 * Sturdy caravan shotgun
 * Caravan shotgun
 * Lever-action shotgun
 * Single shotgun

Appearances
only appears in Fallout: New Vegas.