Tired of watching .308 caliber rounds bouncing off of the OP enemies introduced by the Various DLC (Super Mutant Overlords, Feral Ghoul Reavers and Albino Radscorpians).  Here is a  better sniper rifle.  This weapon has longer range, higher accuracy, and a better scope.  It will knock down almost any opponent, and will one-shot kill most opponents with a head-shot from stealth.  .50 Caliber rounds are placed around the Capital Wasteland, and in the various DLC areas.  And the ultimate piece