Power factor is the competition world's momentum shorthand: grains × feet per second, divided by 1,000. USPSA minor starts at 125, major at 165. Enter your load's numbers — or run it downrange with the solver.
Downrange power factor (rifle solver)
Power factor falls with velocity. Run your rifle load through the trajectory solver:
Read this before you rely on any number here. Predictions use the standard G1/G7 drag models and the data you enter — they are estimates, not measurements, and they are never load advice. Confirm with live fire at distance. For anything you load yourself, work only from current published manuals (Hodgdon, Sierra, Hornady, Lyman), start low, and work up. TruingLog publishes no load recipes and suggests no charge weights.