| This is an overview article, listing content appearing in multiple Fallout media. For information specific to a given game or TV series, consult the table below. |

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10mm is an ammunition type found in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout 76.
Background[]
Before the War, the powerful 10mm[1] Automatic round was the standard ammunition for the Bureau of Alcohol, Drugs, Tobacco, Firearms and Lasers and other federal agencies, while the military was more reliant on experimental energy weapons (although it remained the round of choice for conventional pistols and submachine guns).[Non-game 1] The Circle G brand of ammunition was one of the most popular, offering excellent centerfire cartridges for a variety of applications.[2]
Variants[]
10mm Auto round[]

Standard 10mm Automatic rounds, offering a balanced performance against unarmored and protected targets.[Note 1]
10mm AP[]

10mm rounds designed to have excellent penetration, but poor expansion: They will not be as affected by armor as normal rounds, but do less damage after penetrating.[Non-game 2][Note 2] AP ammunition is recommended for "larger, bipedal game" according to official Vault-Tec materials.[Non-game 3]
10mm JHP[]

Jacketed hollow point rounds are designed to expand upon impact to increase the amount of energy delivered to the target and increase its wounding potential. If the target is wearing armor, most of this energy will be absorbed by the armor and reduce the damage to the target. The inclusion of a jacket from harder metal around the bullet reduces the expansion, providing a balance between damage and penetration.[Non-game 4][Note 2] JHP ammunition is recommended by Vault-Tec for use in small game hunting.[Non-game 3]
10mm HP[]

Hollow point ammunition expands on impact to maximize the amount of energy delivered. Standard hollow points do not have a harder metal jacket and completely deform on impact, delivering exceptional performance against unarmored target, but severely underperforming against protected ones.[Non-game 4]
Behind the scenes[]
- The above quote comes from a Duck and Cover interview. Chris Taylor also stated that 10mm was "standard ammo for the BATF" as "the military was into energy weapons."[3]
- Joshua Sawyer deliberately asked designers to place 10mm weapons predominantly in Vaults and 9mm weapons out in the wasteland, as he thought 10mm weapons to be more "Vaulty" or futuristic in his mind.[4]
Gallery[]
Notes[]
- ↑ For organization, the rounds are grouped together, although the models for the bullets differ: Fallout 3 has standard ball ammunition, while in Fallout 4 they are modeled as hollow points.
- ↑ 2.0 2.1 Due to the way ammunition modifiers are implemented in Fallout 2, AP ammo offers less performance across the board. In Fallout, they don't work at all.
References[]
- ↑ Fallout and Fallout 2 item description: "{800}{}{10mm Pistol}
{801}{}{A Colt 6520 10mm autoloading pistol. Each pull of the trigger will automatically reload the firearm until the magazine is empty. Single shot only, using the powerful 10mm round. Min ST: 3.}"
(PRO ITEM.MSG (Fallout), PRO ITEM.MSG (Fallout 2)) - ↑ Circle G brand in Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout 76.
- ↑ Question: "10MM pistols and SMGs were abundant in Fallout. Was 10MM ammo standard ballistic military issue at the time of the war?"
Chris Taylor: "It was the standard ammo for the BATF. The military was into energy weapons."
(Chris Taylor interview for Vault13.net) - ↑ Joshua_Sawyer_Formspring_posts/2011: "Was it a deliberate decision to make 10mm weapons very common in vaults and 9mm weapons common outside of them? It felt like 10mm weapons were more military or vault-tec issue while 9mm were civilian.
Yes. 10mm weapons seemed more "vaulty"/futuristic in my mind. "
Non-game
- ↑ Chris Taylor interview for Vault13.net
- ↑ Fallout manual: "10mm AP
The 10mm caliber ammo is designed for pistol or submachinegun size firearms. The AP suffix denotes the round is Armor Piercing. AP rounds have excellent penetration, but poor expansion. They will not be as affected by armor as a normal round, but do less damage after armor to the target." - ↑ 3.0 3.1 Fallout manual: "Pistol
This is your basic ranged weapon. The 10mm round packs a goodly punch, and the Colt pistol is a fine example of workmanship and quality. It is a single shot weapon only, meaning that every time you pull the trigger, you will fire one, and only one, round of ammunition. The 6520 has no problem feeding hollowpoint ammunition for small game hunting, or armor piercing rounds for larger, bipedal game." - ↑ 4.0 4.1 Fallout manual: "10mm JHP
This is another version of the 10mm, but in JHP or Jacketed Hollow Point. Hollow Point ammunition is designed to expand to as large of a size as possible to translate the most energy to the target. Unfortunately, if the target is wearing armor, most of the energy is splatted against the armor and little of it will actually affect the target."

