Hornady Ballistics Calculator
BY Herschel Smith
5 years, 1 month ago
The new Hornady 4DOF ballistics calculator is so precise because it combines what Hornady calls the Four Degrees of Freedom. In other words, it takes into account windage, elevation, range and angle of attack to generate a drag coefficient.
Typically, my ammo column focuses on the technical aspects of ammunition; it’s not a place to tell stories. For this installment, I’m going depart from that because about the only thing better than a good story is a sloppy wet kiss from your spouse or a winning lottery ticket. (Both of which are beyond my ability to deliver.)
Recently, a few magazine editors visited for a week. Egos were on display and opinions were as thick as brass on the range at Gunsite Academy. The purpose of this soiree was to test about two dozen rifles, some purpose-built for connecting at extended distances. I have access to a 1,700-yard range and we spent the day there. My 17-year-old son, Bat, served as the official range rat.
After our 500-yard testing was complete, I told my associates I needed to get the DOPE (data of previous engagement) on my son’s African rifle. This would save a trip back to the range and give him some time behind the gun as payment for the support role he’d been filling. On the outside everyone happily assented, on the inside I’m sure they were thinking it was time to get out of the rain.
The previous evening we’d chronographed the Hornady Precision Hunter ELD-X load for the 6.5 Creedmoor he’d be using. That velocity, along with the bullet and related specifics were entered into Hornady’s 4DOF ballistic calculator, which is available online. I’d printed the results and our goal was to confirm elevation come-ups out to 500 yards. Amazingly, this was done with five shots; my son connected center target at 100, 200, 300, 400 and 500 yards. The data generated by the Hornady 4DOF calculator was spot-on.
This article appeared in 2017, but I’ve never seen their calculator. I see that its results can be sent to spreadsheet. This is nice. I’d rather have the full calculations including math models.
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