Enemies that can have Bullet Reflection removed from them:
Anchormen
Badassasaurus
Blue
Boroks
Buccaneers
Bullymongs
Bulwark
BUL Loaders
Constructors
Captain Flynt
Control Core Angel's Eridium Injector Shields
Craboids
Crabworms
Crawmerax Jr.
Crystallisks
Crystal Skeletons
Dark Web
Dragons
Golems
Greedtooth
Handsome Sorceror
Hyperius the Invincible
Jackenstein
Jack's Surveyors
Jacque O' Lantern
Knights
Large Hyperion Turrets
Necromancers
OMGWTH
Pirate Grenadiers
PWR Loaders
Rouge
Savages
Skags
Skag Riders
Dukino's Mom
Shield Surveyors
Skeletons
Smash Head
Spiderants
Stalkers
Witch Doctors
Woundspike