Hornady knows ammo better than most; its laundry list of high-performance, long-range ammo is a clear testament to that fact. So one would assume that a ballistic calculator from Hornady would perform in line with the ammo it creates. If so, one would assume correctly, as evidenced by the Hornady 4DOF Ballistic Calculator.

We got some one-on-one time with the app at the 2018 Athlon Outdoors Rendezvous. It’s incredibly sophisticated and all the more impressive when you factor in that it’s free.

What Is the Hornady 4DOF?

Available for free on the iPhone and Android stores, the Hornady 4DOF (Four Degrees Of Freedom) solver is becoming the standard for long-range ballistic calculations.

Ideal for precise long-range calculations using select low-drag precision bullets, Hornady’s 4DOF Ballistic 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 calculates the vertical shift a bullet experiences as it encounters a crosswind (referred to as aerodynamic jump).

If you’re looking for layman’s terms because that paragraph makes you’re head hurt, watch the video above. Bottom line: It’s free. What harm could it possibly do to try it out?

For more information, please visit

Up Next

WATCH: A Full-Auto Daniel Defense MK18 Is as Amazing as You’d Expect

The Daniel Defense MK18 has seen heavy use with US Military around the globe,...