Angle of repose for cohesionless sediment varies between about 30 and 42 for cohesionless materials.
It increases with particle size and angularity.

This figure from Julien's (2012) text Erosion and Sedimentation provides some context for selecting an angle of repose in cohesionless sediments.

Lane (1953) also includes a plot to help estimate the angle of repose that can provide some context.

Angle of Repose for Non-Cohesive Material (Lane, 1953)