Over-stabilized bullet
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 bullet´s longitudional axis becomes uncapable
to follow the bending path of the trajectory. Over-stabilization is said
to occur, if the angle enclosed between the bullet´s 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.
  
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