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Thorniley Stopping Power Equation:
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Thorniley Stopping Power is a dimensionless value that estimates a bullet's ability to stop a threat based on its mass and velocity. It provides a comparative measure of terminal ballistic performance.
The calculator uses the Thorniley Stopping Power equation:
Where:
Explanation: The equation emphasizes the cubic relationship between velocity and stopping power, showing that velocity has a much greater impact than mass on terminal performance.
Details: Stopping power calculations help firearms enthusiasts, hunters, and law enforcement personnel compare different ammunition types and make informed decisions about cartridge selection for specific applications.
Tips: Enter bullet mass in grains and velocity in feet per second. Both values must be positive numbers. Use manufacturer specifications or chronograph measurements for accurate results.
Q1: What is a good stopping power value?
A: Higher values indicate better stopping power, but the effectiveness also depends on shot placement, bullet design, and target characteristics.
Q2: Why is velocity cubed in the equation?
A: Velocity has an exponential effect on kinetic energy, which is a major factor in terminal ballistics and stopping power.
Q3: How accurate is this calculation?
A: While useful for comparison, actual stopping power depends on many factors including bullet construction, shot placement, and target physiology.
Q4: Can I use this for rifle and handgun ammunition?
A: Yes, the equation works for both rifle and handgun cartridges, as long as mass and velocity are accurately measured.
Q5: What are typical stopping power values for common calibers?
A: Values vary widely - from single digits for light handgun rounds to hundreds for high-velocity rifle cartridges.