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Power Factor Formula:
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Power Factor is a measurement used in competitive shooting sports to classify ammunition power levels. It's calculated by multiplying bullet weight (in grains) by velocity (in feet per second) and dividing by 1000.
The calculator uses the Power Factor formula:
Where:
Explanation: This formula provides a standardized way to compare the relative power of different ammunition loads across various calibers and bullet weights.
Details: Power Factor is crucial for competitive shooters as it determines which division they compete in. Major power factor loads typically have higher scoring values but produce more recoil, while minor power factor loads have less recoil but lower scoring potential.
Tips: Enter bullet weight in grains and velocity in feet per second. Both values must be positive numbers. For accurate results, use chronograph-measured velocity data.
Q1: What are typical power factor values?
A: Major power factor is typically 165+ and minor power factor is typically 125-164, though exact thresholds vary by competition organization.
Q2: Why divide by 1000 in the formula?
A: The division by 1000 simply scales the result to a more manageable number while maintaining the relative relationship between different loads.
Q3: How accurate does my chronograph need to be?
A: For competition purposes, you'll want a reliable chronograph with consistent readings. Most competitions require multiple shots (typically 3-10) to calculate an average velocity.
Q4: Does temperature affect power factor?
A: Yes, temperature can affect powder burn rates and thus velocity. It's recommended to chronograph your loads in conditions similar to those expected during competition.
Q5: Can I use this calculator for rifle loads?
A: While the formula works the same, power factor is primarily a handgun competition metric. Rifle competitions typically use different classification systems.