It functions very much the same as the standard anti-materiel rifle with increased damage, health and no spread. It was intended to be used by an NCR sniper at Hoover Dam, but the cell containing the sniper was cut from the final game.
Durability
The Oliver anti-materiel rifle can fire a total of about 870 standard rounds, the equivalent of 109 reloads, from full condition before breaking.
Locations
The Oliver anti-materiel rifle can only be obtained via console commands.
Notes
It will appear in the Pip-Boy as anti-materiel rifle, but it can not be stored or picked up if dropped; this is due to it being marked non-playable.