Another way to look at a 150 degree angle is a total of 30 degrees (a straight line is 180). Unless the bend is a long radius, you won't be able to bend the base. Mitering with a 15 degree inside miter cut (through the face of the trim if the bend is into the room, through the back of the trim if the bend is away from the room) will split the difference and give you a smooth inside or outside corner.

relief plunges in the back and steam and clamps slowly over time. If inside then miter cuts and some coping work to match the profile.