Unused Content Overviews 
The following is based on Fallout: New Vegas Unused Content .22LR Round, Junk is a type of unused ammunition in Fallout: New Vegas.
Gameplay
A new ammunition subtype, JNK, or junk rounds, was included in the Dead Money add-on. The new ammunition type existed for all Guns skill ammunition and provided the same effects for all calibers: 0.75x to Damage and 1.5x to Gun Condition. The new ammunition type covers two calibers which are not included in the existing version of the perk: .22LR Rounds and 12.7mm Rounds.
However, the recipes granted by taking the Junk Rounds perk simply produce one round of normal ammunition, rather than of the junk subtype. JNK-subtype ammunition is not used anywhere in the add-on, and cannot be obtained by normal means. If it is obtained, it cannot be used in any weapons, as the ammunition is not added to the appropriate lists used to determine what ammunition types a weapon can load.
Comparison
| Modifiers and Effects | ||||||
|---|---|---|---|---|---|---|
Type  | Weapon Damage  | Target Damage Threshold  | Weapon Condition  | Weapon Spread  | Craftable  | Empty Casing % |
| .22LR Round | x 1 | x 1 | x 1 | x 1 |  | 0% chance |
.22LR Round, Junk  | x 0.75 | x 1 | x 1.5 | x 1 | | 0% chance |
| .22LR Round, Plinking | x 0.85 | x 1 | x 1 | x 1 | | 0% chance |
| .22LR Round, Hollow Point | x 1.75 | x 3 | x 1 | x 1 | | 0% chance |
Fallout: New Vegas Ammunition