R Retardation fps.s.
V Velocity fps.

R=A*V^m

Ingalls Ballistic Constants

V(feet/sec)     A                       m

3600-2600       4.0648825E-03           1.55
2600-1800       1.2479524E-03           1.7
1800-1370       1.3160125E-04           2
1370-1230       9.5697809E-08           3
1230- 970       6.3368148E-14           5
 970- 790       5.9353046E-08           3
 790-   0       4.6761777E-05           2