As a tip from somebody who completed Ultra-Nightmare, the shots can fire before the zoom is fully activated, so players never have to slow down or have their viewing area reduced before getting a shot off. Though sniping might not seem to have a home in Doom Eternal with the quick combat, some bosses essentially require the Precision Bolt to defeat. Mastery: Headshot Blast - A headshot kill will set off a powerful, secondary blast that deals damage to nearby demons. Upgrade: Fast Loader - Precision Boly reload speed is increased by 20%. Upgrade: Mobility - Movement Speed while using Precision Bolt is increased by 15%. Mod: Precision Bolt - Brings up a semi-automatic loader that fires high-precision, high-powered rounds.