12.7mm round

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12.7mm round
127mmRound.png127mm bullet.png
12.7mm round.png
12.7mm round
base id001429cf
12.7mm round, hollow point
base id001613d4
12.7mm round (hand load)
base idxx000a2b
12.7mm round (junk) Cut contentIcon cut.png JSawyerSourcebox default.png
base idxx00fb6d

12.7mm rounds are a rare type of ammunition that was manufactured before the Great War by Hauer Premium, and can be found in Fallout: New Vegas.

Characteristics[edit | edit source]

The Hauer Premium Show Stopper 12.7mm civic defense round is a consumer-grade pistol round. In essence, these rounds consist of a big flat bullet in a straight case, with a rebated rim.[1] While they have an identical bullet diameter to the military-grade .50 caliber, the much smaller case means it holds less powder and can be safely used in man-portable auto-loading weapons.

Weapons using this ammunition[edit | edit source]

Crafting[edit | edit source]

31 Lead

Variants[edit | edit source]

12.7mm round, hollow point[edit | edit source]

Hollow point bullets mushroom and break up on impact, causing massive trauma on fleshy, unarmored targets. However, this also means they break up when they hit things like armor plate; drastically reducing the weapon's penetrating power.

12.7mm round (hand load) (GRA)[edit | edit source]

A new type of ammunition added with the add-on Gun Runners' Arsenal, JHP, or jacketed hollow point, uses a metal-clad bullet that retains most of the damage bonus of ordinary hollow point rounds, but with a less severe armor penalty.

12.7mm round (junk)[edit | edit source]

Sourcebox default.pngThe following is based on the JSawyer mod and has not been confirmed by canon sources.

Junk rounds are makeshift bullets made from materials commonly found while scavenging, such as scrap metal and tin cans. Junk rounds are only good as a last resort ammo-type, as firing them causes extra wear on the firearm, and do all around less damage.


Comparison[edit | edit source]

Name Damage Damage Threshold Condition Weapons Spread Other Craftable Empty Casing
12.7mm round x 1 x 1 x 1 x 1 Yes 20% Chance
12.7mm round, hollow point x 1.75 x 3 x 1 x 1 No 20% Chance
12.7mm round (hand load) Gun Runners' ArsenalGametitle-FNV GRA.png x 1.65 x 2 x 1 x 1 Yes 20% Chance
12.7mm round (junk) Cut contentIcon cut.png JSawyerSourcebox default.png x 0.95 x 1 x 1.2 x 1 Yes 20% Chance

Notable locations[edit | edit source]

Notes[edit | edit source]

12.7mm is basically something in the .50 AE / .50 Beowulf range: big flat bullet, straight case, rebated rim.

J.E. Sawyer
  • 12.7mm rounds could not be made at the reloading bench prior to patch, and could not be broken down prior to patch
  • 12.7mm rounds weighed 0.0064 units each - one-tenth their current weight - prior to patch
Icon cut content.pngThe following is based on Fallout New Vegas cut content and has not been confirmed by canon sources.

The Junk Rounds perk from the Dead Money add-on was at one point intended to create ammunition of a special subtype. Called "Junk" or "JNK", these rounds all provided the same modifiers regardless of caliber: 0.75x to Damage and 1.5x to Gun Condition. The rounds remain present in game code but are not placed in any locations, and if somehow obtained cannot be used in any weapons, even those chambered for the correct caliber.

Curiously, the presence of 12.7mm JNK rounds indicates that the perk was to provide a recipe for crafting 12.7mm rounds, though the final version of the perk does not include one. JSawyer integrates these rounds into the Junk Rounds perk and allows them to be craftable in the game as originally intended.

Icon cut content.pngEnd of information based on Fallout New Vegas cut content.

Bugs[edit | edit source]

  • PCIcon pc.png Xbox 360Icon xbox360.png Buying a case box 12.7mm from the Gun Runners will sometimes cause the game to crash.
  • 12.7mm JHP rounds are simply listed as '12.7mm round (GRA)'.


  1. J.E. Sawyer: "12.7mm is basically something in the .50 AE / .50 Beowulf range: big flat bullet, straight case, rebated rim."