Extreme Spread Calculator
Unit Converter ▲
Unit Converter ▼
From:  To: 
Historical Background
The concept of extreme spread (ES) originates in the field of ballistics, providing a measure of the variability in projectile velocities within a series of shots. It is commonly used by marksmen, ammunition manufacturers, and ballistic analysts to evaluate the consistency of firearms and ammunition performance.
Formula
The calculation formula for extreme spread is straightforward:
\[ ES = HV  LV \]
where:
 \(ES\) is the extreme spread in feet per second (fps),
 \(HV\) is the highest velocity in the group (fps),
 \(LV\) is the lowest velocity in the group (fps).
Example Calculation
If the highest velocity in a group of shots is 2800 fps and the lowest velocity is 2750 fps, the extreme spread is calculated as:
\[ ES = 2800  2750 = 50 \, \text{fps} \]
Importance and Usage Scenarios
Extreme spread provides insight into the consistency of firearm or ammunition performance. A lower ES is desirable, indicating more uniform shot velocities and higher accuracy potential. It is used in ammunition testing, load development, and competitive shooting to evaluate and improve shooting performance.
Common FAQs

Is a lower extreme spread better?
 Yes, a lower ES typically indicates more consistent performance, contributing to improved accuracy.

What factors can affect extreme spread?
 Variations in powder charge, bullet weight, barrel temperature, and firearm quality can all influence the extreme spread.

How is extreme spread different from standard deviation in ballistics?
 Extreme spread measures the difference between the highest and lowest velocities, while standard deviation provides a statistical measure of velocity variability across all shots.
Understanding extreme spread and using it alongside other ballistic metrics can help shooters refine their techniques and ensure that their firearms and ammunition are performing at their best.