Bullet Comparison Calculator

The Bison Ballistics calculator is a modern ballistics calculator for sportsmen. To use it, just pick two bullet from our library, fill in the appropriate information and click "Calculate".

About the Bullet Comparison Calculator

How do I use the bullet comparison calculator?

Just select two bullets, and then enter a muzzle velocity for each one. The calculator will generate trajectories for each bullet and output comparison data.

Why are there so few inputs?

The comparison tool is a simplified calculator to get a basic idea as to how two bullets will perform. The calculator makes the following assumptions:

Zero Range	The zero range isn't relevant to this calculation - it reports total drop, which is adequate for comparison purposes.
Wind Speed	The wind speed is assumed to be 10 mph.
Wind Heading	A wind from 9 o'clock to 3 o'clock is assumed (full value left to right from the shooter's perspective).
Sight Height	Like the zero range, sight height isn't relevant to this calculation - it reports total drop, which is adequate for comparison purposes.
Temperature	The temperature of the air is that of the IACO standard atmosphere - 59 ºF.
Pressure	The absolute (station) pressure is assumed to be that of the ICAO standard atmosphere - 29.92 mmHg.
Relative Humidity	The absolute (station) pressure is assumed to be that of the ICAO standard atmosphere - 0%.

What if I want a more detailed calculation?

Then use the fully featured Ballistics Calculator. It allows for more inputs so you can get a more accurate trajectory that will apply to your specific conditions.

I'm trying to see if I should switch bullets. Is there a way to estimate the velocity of the bullet I'm considering?

Yes, there are a few to do that without actually purchasing the bullets and testing. The first is to use our quick and easy Velocity Estimation Calculator, which will give you a very rough idea of what you can expect. Other, potentially more accurate ways would be to use a reloading manual or QuickLOAD to get a more detailed estimate. QuickLOAD is probably going to provide the most accurate estimate.