.22LR Round

 is a type of ammunition in Fallout: New Vegas.

Characteristics
It is a very low caliber round, especially when compared to the more common .223, .308, .44, or .45 that are also used in the post-War world.

The .22 was used as a commercial hunting round, but wasn't as common on the East Coast as the .32.

Used in

 * Varmint rifle
 * .22 pistol
 * Silenced .22 SMG

Appearances
only appears in Fallout: New Vegas.