This figure schematically shows an over-stabilized bullet on a high-angle trajectory.
An over-stabilized bullet rotates too fast and its axis tends to keep its orientation in space. The bulletīs longitudional axis becomes uncapable to follow the bending path of the trajectory. Over-stabilization is said to occur, if the angle enclosed between the bulletīs axis of form and the tangent to the trajectory (the yaw of repose) exceeds a value of approximately 10°.
Over-stabilization of a bullet is most probable, if a bullet has excessive static stability (a high value of sg and a low value for the tractability factor ) and is fired at a high angle of departure, especially when fired vertically. An over-stabilized bullet on a high-angle trajectory lands base first.
However, when firing bullets from handguns, over-stabilization is of minor importance in normal shooting situation, but must be considered when firing at high angles of elevation.