Hey everyone, I have been getting into precision shooting lately and I need a little help. I haven’t done much rifle shooting besides my AR and that wasn’t usually more than 100 yards and other than that is all pistol shooting.
I am getting ready to buy my first bolt gun in .308 and I want to make my own ballistic cards to take to the range with me. I was wondering what information I should have on all these cards and im guessing it should be a separate card for each type of ammunition, am I right on that.
If anyone can give me advice and maybe give me some examples of what your ballistic cards look like it would really be appreciated.
You’d be better off making your own cards by going to the range, and figuring out what your gun and ammo is doing. There is no replacement for actually doing it yourself as every combo acts differently.
With that said I use KAC Bullet Flight to give me a rough idea of where Ill be, and then tweak my settings from there. For instance with my MK12 clone rig with Mk262 type ammo it put me at 9 clicks down for 300 yards, and I was shooting a couple inches low. So my actual down clicks actually shooting the gun is more like 12 clicks.
On the card you want at minimum 50 yard or meter (whatever you prefer) graduations, 10MPH wind measurements.
I’m using JMB for my cards for my 77 grain reloads. Run the data, print it or just copy what you need to excel for printing. You do need to verify at the range to be sure you have everything entered correctly. Your actual chronographed velocity is needed as well.
In verifying at 700 Meters, I was off several MOA until I realized I needed to override the default air pressure with an absolute (or station) pressure for my area - about 24.75" Hg at 5,000 feet instead of the default 29.92" at sea level.
Thanks everyone for the information its helping out a lot. I got another question though, when I go to certain websites and look up the manufactured ammo im using (I don’t have reloading stuff at this time) it doesn’t show wind drift, is there a way to figure that out? Also how do you figure out the bullet coefficient as some of the websites don’t show that?
The majority of your “match” grade factory ammo manufactures are using projectiles with easy to find information such as Federal Premium Gold Medal 175gr uses Sierra 175gr BTHP projectiles, one of the most widely used projectiles for .308WIN.
As said before you can use JBM calculators to create your data.
