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November 3rd, 2017

Hornady Releases Free Mobile Ballistic App with 4DOF™

Hornady Ballistic Ballistics App Mobile 4DOF degrees of freedom aerodynamic jump Android Apple iOS

Hornady Ballistic Ballistics App Mobile 4DOF degrees of freedom aerodynamic jump Android Apple iOSHornady has released a new FREE Ballistic Calculator App for iOS (Apple) and Android OS. This new Mobile Ballistic App includes Hornady’s advanced 4DOF™ calculator as well as a standard BC (ballistic coefficient) calculator. The Hornady Ballistic Calculator App is Bluetooth-enabled so it can communicate with select wind meters.

The Hornady Ballistic App is FREE but you do need to supply an email address. We found the App downloaded quickly and installed easily. While the Mobile Ballistic App is new, Hornady has offered a web-based online 4DOF Ballistic App since August 2016.


GET Apple iOS Version HERE | GET Android OS Version HERE

Hornady’s new 4DOF™ (4 Degrees of Freedom) Ballistic Calculator has become a popular resource for those seeking more accurate trajectories, especially at extreme ranges. The Hornady 4DOF calculator provides trajectory solutions based on projectile Drag Coefficient (not ballistic coefficient) along with the exact physical modeling of the projectile and its mass and aerodynamic properties. Additionally, it is the first publicly-available program that will correctly calculate the vertical shift a bullet experiences as it encounters a crosswind; referred to as aerodynamic jump. Hornady claims that: “The use of drag coefficients, correct projectile dynamics, aerodynamic jump, and spin drift enable the Hornady 4DOF ballistic calculator to be the most accurate commercial trajectory program available[.]”

“Current ballistic calculators provide three degrees of freedom in their approach; windage, elevation and range, but treat the projectile as an inanimate lump flying through the air,” said Dave Emary, Hornady Chief Ballistician. “This program incorporates the projectile’s movement in the standard three degrees but also adds its movement about its center of gravity and subsequent angle relative to its line of flight, which is the fourth degree of freedom.”

Hornady Ballistic Ballistics App Mobile 4DOF degrees of freedome aerodynamic jump Android Apple iOS

Bullet Drag Profiles Created with Doppler Radar
Using Doppler radar, Hornady engineers have calculated exact drag versus velocity curves for each bullet in the 4DOF™ calculator library. Hornady engineers say this makes the 4DOF™ calculator “more accurate for long range hits than … BC-based systems or custom drag curves based on limited data collection points.”

The 4DOF ballistic calculator is used with pre-populated bullet files that include long range match and hunting style bullets from Hornady including ELD-X and ELD Match bullets. In addition, popular long range projectiles from Sierra, Berger, and other bullet-makers are included. To view the web-based version of 4DOF and see the projectiles available, visit www.Hornady.com/4dof.

Standard Ballistics Calculator Functionality
The new Hornady Mobile App also features a standard BC-based calculator for use with bullets not listed in the 4DOF database. Users can enter their own G1 or G7 BC, or choose from the entire lineup of Hornady bullets and ammunition in easily-filtered, pre-populated lists.

Installation and User Feedback
We installed Hornady’s new Mobile Ballistic App on an Apple iPhone 5s and and older Samsung Galaxy. The App downloaded quickly and installed flawlessly on both platforms. We were able to register easily (once we added a Capital Letter to the password) and the App launched without a hitch. This Hornady App is FREE but it does require users to submit an email address. This enables Hornady to send marketing messages, but registered users may opt out.

NOTE: A couple iOS and Android users reported issues with registration. This might be a software bug (or, more likely, it was user error) but we thought we should report this:

From Apple App Store Reviews:
“Tried registration, failed on the App and it won’t take my site info.” — Heavy G 603

“App crashes right after the two accept buttons.” — Austin.M

From Google Play Reviews:
“Required registration works on website but not for this app…” — Ken S., 11/2/17

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August 19th, 2016

New Hornady Ballistics Calculator Uses Doppler Radar Bullet Data

Hornady Ballistics Calculator 4DOF Doppler Vertical Jump Spin Drift Angle of Attack

Here’s a significant new addition to our knowledge base for Long-Range shooting. Hornady has released a new Ballistics Calculator that employs bullet profiles derived from Doppler radar testing and 3D projectile modeling. Hornady’s Patent Pending 4DOF™ Ballistic Calculator provides trajectory solutions based on projectile Drag Coefficient (not static G1/G7 ballistic coefficients) along with the exact physical modeling of projectiles and their mass and aerodynamic properties. This new 4DOF (Four Degrees of Freedom) calculator also accounts for spin drift and the subtle VERTICAL effects of crosswinds.


We strongly recommend you watch this video from start to finish. In greater detail than is possible here, this video explains how the 4DOF System works, and why it is more sophisticated than other commercially-offered Ballistics calculators. There’s a LOT going on here…

Aerodynamic Jump from Crosswind Calculated
According to Hornady, the 4DOF Ballistics Calculator “is the first publicly-available program that will correctly calculate the vertical shift a bullet experiences as it encounters a crosswind.” This effect is called aerodynamic jump. The use of radar-derived drag profiles, correct projectile dynamics, aerodynamic jump, and spin drift enable the Hornady® 4DOF™ ballistic calculator to provide very sophisticated solutions. Hornady says its 4DOF solver is “the most accurate commercially available trajectory program … even at extreme ranges.”

“Current ballistic calculators provide three degrees of freedom in their approach — windage, elevation, and range — but treat the projectile as an inanimate lump flying through the air,” said Dave Emary, Hornady Chief Ballistician. “This program incorporates the projectile’s movement in the standard three degrees but also adds its movement about its center of gravity and subsequent angle relative to its line of flight, which is the fourth degree of freedom.”

Using Doppler radar, Hornady engineers have calculated exact drag versus velocity curves for each bullet in the 4DOF™ calculator library. This means the 4DOF™ calculator should provicde more precise long range solutions than calulators that rely on simple BC numbers or drag curves based with limited data collection points. Emary adds: “The Hornady 4DOF also accurately calculates angled shots by accounting for important conditions that [other ballistic] programs overlook.”

“This calculator doesn’t utilize BCs (Ballistic Coefficients) like other calculators,” added Jayden Quinlan, Hornady Ballistics Engineer. “Why compare the flight of your bullet to a standard G1 or G7 projectile when you can use your own projectile as the standard?” That makes sense, but users must remember that Hornady’s 4DOF projectile “library” includes mostly Hornady-made bullets. However, in addition to Hornady bullets, the 4DOF Calculator currently does list seven Berger projectiles, six Sierra projectiles, and one Lapua bullet type. For example, Sierra’s new 183gr 7mm MatchKing is listed, as is Berger’s 105gr 6mm Hybrid.

This Video Explains How to Use Hornady’s New 4DOF Ballistics Calculator

Hornady Ballistics Calculator 4DOF Doppler Vertical Jump Spin Drift Angle of Attack

Using the 4DOF™ Ballistic Calculator:
The Hornady 4DOF Ballistic Calculator provides trajectory solutions based on projectile Drag Coefficient (not ballistic coefficients) along with exact physical modeling of the projectile and its mass and aerodynamic properties. Additionally, it calculates the vertical shift a bullet experiences as it encounters a crosswind, i.e. “aerodynamic jump”. The use of drag coefficients, projectile dynamics, aerodynamic jump, and spin drift enable the 4DOF Ballistic Calculator to accurately measure trajectories even at extreme ranges. It is ideal for both long range and moderate distances and is available for the low-drag precision bullets listed in the drop down menu of the calculator. For calculating trajectories of traditional hunting and varmint bullets using BCs (ballistic coefficients), you can use Hornady’s Standard Ballistics Calculator.

Hornady Ballistics Calculator 4DOF Doppler Vertical Jump Spin Drift Angle of Attack

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