20 Gauge Round

20 gauge shotgun shell is a type of ammunition in Fallout: New Vegas.

Production
Standard buckshot, magnum buckshot, 3/0 magnum buckshot and slug 20 gauge shotshell can be crafted at a reloading bench. A single shell requires the following ingredients:

Breakdown
Breaking down a standard 20 gauge shotshell yields:

Weapons using this ammunition

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

20 gauge, magnum
Magnum shells are standard buckshot shells fitted with a higher internal powder load, increasing velocity and stopping power. The downside is that they cause more damage to the firearm used due to the higher overall pressure, requiring more regular maintenance.

20 gauge, slug
Slugs contain a large lead projectile promoting better accuracy and kinetic energy over a distance. Slugs enable a shotgun to engage targets at a further distance.

20 gauge, 3/0 buck
A sub-type added with the add-on Gun Runners' Arsenal, these loads sacrifice quantity for quality, in other words, there are fewer projectiles overall but they're heavier and pack a bigger punch.

20 gauge, 3/0 buck magnum
A sub-type added with the add-on Gun Runners' Arsenal, these magnum shells use the larger 3/0 shot size, but with a greater powder load resulting in higher velocity. The Hand Loader perk is required to craft it.

20 gauge, pulse slug
A sub-type added with the add-on Gun Runners' Arsenal, these slugs cause more damage to power armor and robots, and the target gets an extra kick from an electromagnetic pulse triggered by the impact.

Locations
Cliff Briscoe at the Dino Bite gift shop in Novac randomly stocks 20 gauge, 20 gauge slug and 20 gauge pulse slug.