Is Anti-Materiel Rifle worth 7000 caps in Fallout New Vegas?

The alien blaster is the most powerful gun in Fallout 3 one shot kill. You can find it north of the MDP13-Power Station, west of Green Pastures Disposal. Its west of a small road. You should hear an alien transmission on your radio. Make sure you don't waste your ammo on weak creatures because you only get 110 cells.