Truing Your Data for Long-Range Shooting

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Truing Your Data for Long-Range Shooting

September 9th, 2022

7:09 runtime

With modern technology, it can be easy to oversimplify the long distance shooting process. Now, I’m not saying that it has to be incredibly complicated, either. But, some of the modern ballistic computers can make things seem 100% true, while the truth is that they’re not.

truing data for long range shooting
Organizing your shooting data is important for precision rifle shots. The Snipers Data Book Kit from is a great way to do this.

Aside from just the computer being a “hunk of junk” and giving you bad DOPE (which is likely not the case), there can be other more tangible factors that cause you to miss in long-distance shooting. The best way to handle this is to build your own DOPE and not depend on a computer for every detail.

checking your scope data
Don’t depend on shooting computers to provide all of the data you need. Spend time on the range to get the precise data.

With as smart and as advanced as computers and machines are in the world we live in, how can they ever be wrong? Well, there are a couple ways, actually. It’s not really that they are wrong, it’s more that your setup doesn’t match theirs. Technically, I’m sure the computer isn’t wrong, but every factor matters.

adjusting scope turret to true data
Do you know where that round is going to go? Keeping accurate shooting data can help you put your first round exactly where you mean to land it.

For example, something we have seen firsthand is that a rifle barrel has a break-in period where it has to warm up. If you have a brand new rifle, it will shoot slower than it’s supposed to guarantee. We recommend putting 200 rounds through your rifle before you can consider its muzzle velocity to be consistent. The rifling in the barrel has a break-in period where it will get faster and faster velocity until it breaks through that new threshold.

The issue is that not knowing your true muzzle velocity leaves a hole in a ballistic computer’s equation. There are devices to help you measure this so you can fill in the gap, however. That is just one way that data from a ballistic computer may mislead you.


So how do you fix this and get faster than the computer? The only solution is to get out, shoot some rounds and do something we call truing your data. You will need to build your own DOPE for your rifle and your ammunition of choice. Those two things need to be as consistent as possible, so make sure you stick with the exact same brand of ammo. If it is in the same lot number, then that’s even better.

shooting the rifle to check your scope dope
A computer cannot compensate for all possible variables in your shooting. You need to get out and get rounds down range to true your DOPE.

Where do you start truing your data? Zero your gun at 100 yards, have a good zero you are confident in, and shoot an actual group of at least five to six rounds with this zero to confirm it. Next, Grant recommends going and shooting with your cartridge at a distance just before it starts to exit its supersonic flight and enter transonic flight into subsonic flight.

For the 6.5 Creedmoor Model 2020 Waypoint we have on hand, we shot at 700 yards for this purpose. We took a spotter who watched through the spotting scope and walked our round into the target one miss at a time, starting with the computer’s DOPE until we hit the target. When our point of impact hits our point of aim, we input that MIL setting into the computer to true the data. This should auto calculate the rest of the distances on your computer’s DOPE.

American Snipers Data Book
As you work out your DOPE, make sure you keep accurate records. As you change aspects of your shooting — such as the load shot — you need to record additional data.

Now your DOPE is perfect and you will never miss! Right? Wrong. Now you need to work your way back in at some other distances and try testing it farther out. But you should be much closer to fully understanding your rifle now.

After you have trued your data further, Grant suggests writing it down, typing it up, printing it off and carrying it with your long distance gear. Now, in theory, who even needs a computer if you’re shooting around the distances you have mapped? That’s not entirely true, so don’t toss your ballistic computer in the trash just yet. The computer still serves a purpose, and now that you have trued the data it will be that much more accurate.

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Springfield Armory® recommends you seek qualified and competent training from a certified instructor prior to handling any firearm and be sure to read your owner’s manual. These articles and videos are considered to be suggestions and not recommendations from Springfield Armory. The views and opinions expressed on this website are those of the authors and do not necessarily reflect the views and opinions of Springfield Armory.

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GunSpot was created to be the one spot for everything gun-related. With us, you can buy or sell guns. We have everything from small-caliber pistols to belt-fed machine guns. And on the GunSpot Academy, you can find high-quality original content. In our content, you will see two faces regularly. Dylan Casey is a gun enthusiast with a digital media degree who is GunSpot's Creative Director. Then there is Chief Instructor Grant LaVelle, who has decades of experience training Marines, police officers and citizens alike. Grant served with and taught marksmanship for the United States Marine Corps. After his time with the Marines, Grant served as a SWAT sniper.

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