July 18, 2026

Hornady 4dof

This is highly regarded ballistics software from Hornady. I downloaded it to my android phone, but now it wants me to have a login with Hornady.

I go to their website on my desktop, go to "My Account" and then use the "Register" link.

But then I cannot login from my phone. I tell it to reset my password, set the exact same password again, and after restarting the process on my phone I finally manage to get in.

Here is a 12 minute video on how to get set up with the Hornady 4dof app with Seth Swerczek from Hornady:

Rifle, ammo, and environment. Their library includes Berger, Sierra, and most bullets that you might use. If your bullet is not listed, you can use their BC calculator.

Click the 4dof tile, then go to favorites, then use the + button. You add rifle and ammo.

6.5 RPR has 1:8 twist 24 inches and sight height of 2.75 inches
	optic is Nightforce NXS 5.5-22x50 moa
.308 Savage has 1:10 twist 24 inches, sight height of 2.5 inches
	optic is Vortex PST 5-25x50 mrad
I do this, adding two rifles that I have. But what about different types of ammunition for each rifle. The thing to do is to clone a profile, then modify the ammo parameters. Click the 3 dots next to the rifle and a menu appears which include "clone"
6.5 CM 140gr Hornady HPBT  35 grains Varget  2540 fps    12-2025
308  168 gr HPBT  42 grains Varget  2715 fps    12-2025

It will generate a "standard" ballistic table -- use the grid icon at the bottom right. A tip is to generate this, take a screen shot, then set this as the phone background. To take a screen shot on my Pixel Android, I hold power and volume down until the magic happens. Then to set this as background, I go to photos, select the image, find the 3 dots, select "Use as", then wallpaper.

You can use it on a tablet! You can use 4dof without a cell connection. For my tablets (which never will have cell connectivity) I would have to link up at home using Wifi, then take the tablet into the field.

There is no way to access the favorites I set up with my phone on the web based app, which is truly unfortunate.


Feedback? Questions? Drop me a line!

Tom's Computer Info / tom@mmto.org