Angulation of the counter bevel placed in cast restoration is determined by:
Angulation of the Counter Bevel
Measured by the embracing angle: Angle between the bevel and the long axis of the crown - 30 to 70 degrees.
Factors Determining the Angulation
1. Amount of indicated involvement for the facial / lingual surface:

The more the desirable involvement is, the less will be the embracing angle to preserve tooth structure.

2. Amount of needed retention:

The shorter the preparation walls, the less will be the embracing angle with the long axis.
May be parallel to the intracoronal wall proper.

3. Type of cast alloy:

The less the castability, the greater will be the embracing angle.
Allows more bulk marginally.
Amount of indicated involvement for facial/lingual surface
Measured by the embracing angle
Amount of needed retention
All of the above