Gametitle-FNVGametitle-FNV GRA
Gametitle-FNVGametitle-FNV GRA

12.7mm rounds are a rare type of ammunition manufactured by Hauer Premium in Fallout: New Vegas.


The Hauer Premium Show Stopper 12.7mm civic defense round is a large 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 .50 caliber rifle round, the much smaller case means it holds less powder and can be safely used in man-portable auto-loading weapons.


Standard and JHP 12.7mm rounds can be crafted at a reloading bench. A single cartridge requires the following ingredients:

Lead (31)
Icon range
Repair: 60
Icon level
12.7mm round (1)
Lead (34)
Icon range
Repair: 75
Icon level
12.7mm, JHP (hand load) (1)


Breaking down a standard 12.7mm round yields:

12.7mm (1)
Icon range
Repair: 60
Icon level
Lead (28)

Weapons using this ammunitionEdit


12.7mm round, hollow pointEdit

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 (junk)Edit

Icon cut contentThe 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. This may be a bug or oversight, similar to 12.7mm ammunition's initial absence from most merchant inventories and the lack of a crafting recipe for the ammunition.

JSawyer integrates these rounds into the Junk Rounds perk and allows them to be craftable in the game as originally intended.

Icon cut contentEnd of information based on Fallout: New Vegas cut content.

12.7mm round, JHP hand loadEdit

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.


Assault carbine extended magazines Icon damage Icon shield gold Icon repair Icon spread Icon crafting Icon chance
12.7mm round, standardx 1x 1x 1x 1Icon check20% chance
12.7mm round, junkx 0.75x 1x 1.5x 1Icon cross20% chance
12.7mm round, JHP (hand load) Gametitle-FNV GRAx 1.65x 2x 1x 1Icon check20% chance
12.7mm round, hollow pointx 1.75x 3x 1x 1Icon cross20% chance



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 - one-tenth their current weight - prior to patch
  • 12.7mm hollow point rounds have the same Pip-Boy image as .45-70 Gov't rounds, not the usual from the regular 12.7mm round.



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