VH>Actually, assuming you have straight up-and-down alignment, there WILL
VH>be some coriolas-induced drift -- which will be predictable.  You could
VH>also get straight up and down alignment by level and cross-level.  It's
VH>wind-drift that would be most unpredictable -- because you'd have to
VH>have a true picture of windspeed and direction at every altitude level.
Not really.  Only the altitudes that the bullet will reach.  ;^)
Jim Page 
 
AKA Elmer Fudd
... UNREGISTERED EVALUATION COPY
 * Wave Rider 1.32 [NR] *
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