Enter your bullet weight and muzzle velocity into the calculator to determine the energy of your 45/70 cartridge.
Energy Calculation Formula
The following formula is used to calculate the energy of a bullet:
Energy (ft-lbs) = (Bullet Weight (grains) * Velocity (fps)²) / 450240
Variables:
- Energy is the kinetic energy of the bullet (ft-lbs)
- Bullet Weight is the weight of the bullet (grains)
- Velocity is the speed of the bullet at the muzzle (fps)
To calculate the energy, multiply the bullet weight by the square of the velocity and divide by 450240.
What is 45/70?
The .45-70 Government is a rifle cartridge that was developed in 1873 for the U.S. Army. It is known for its large diameter and heavy bullet, making it effective for hunting large game. The cartridge has a rich history and is still popular among hunters and sport shooters today.
How to Use the 45/70 Calculator?
The following steps outline how to use the 45/70 calculator:
- First, enter the bullet weight in grains.
- Next, input the muzzle velocity in feet per second.
- Click on the “Calculate” button to determine the energy of the bullet.
- For advanced calculations, enter the distance and bullet drop to find the energy at that distance.
- Check your results and adjust your inputs as necessary.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Bullet Weight = 300 grains
Muzzle Velocity = 1800 fps
FAQ
1. What is the significance of bullet weight?
Bullet weight affects the energy and trajectory of the bullet. Heavier bullets typically retain energy better over distance.
2. How does muzzle velocity impact performance?
Muzzle velocity is crucial as it determines the initial speed of the bullet, influencing its energy and trajectory.
3. Can this calculator be used for other calibers?
While this calculator is designed for the 45/70 cartridge, the formulas can be adapted for other calibers by adjusting the inputs.
4. Is the energy calculated the same as stopping power?
No, energy is a measure of kinetic energy, while stopping power is a more subjective measure of a bullet’s effectiveness in stopping a target.
5. How accurate is the calculator?
The calculator provides estimates based on the inputs provided. For precise measurements, consult ballistic tables or a professional.