[StubbornRussian]

Double barrel the occassional scare card against villains who have a high percentage of calling cbets. I will also double barrel rag boards against tag regs if I open utg since they will often call in position with a pocket knowing that if you have a big pair you will fire twice at which time they can fold. In general though, as others have already said, there really is no need to double barrel bluff too often. Just wait until you hit and you will get paid off. Solid poker is easy money at microstakes.