|The following is based on Fallout: New Vegas cut content and has not been confirmed by canon sources.|
The .30-30 round was a type of ammunition that was planned for inclusion in Fallout: New Vegas. From the Pip-Boy icon, the .30-30 round would have been a soft-point, also known as soft-nose, bulleted cartridge that likely would have been chambered in a lever-action rifle like the cowboy repeater or trail carbine. .30-.30 rounds were cut from the game due to it supporting few weapons on its own and having too much overlap with .308.
The only existing evidence of this cartridge is present in the game files, as an unused icon for the Pip-Boy 3000.