A ballistic calculator can give you an elevation solution for almost any distance. The bigger question is whether you actually know the trajectory of your rifle well enough to use that information quickly.
One way to improve that understanding is to start with something most long-range shooters already have: verified elevation data in 100-yard increments.
Those 100-yard numbers become your hard index points. From there, you can build a second reference chart that assigns an approximate distance to every 0.1 MIL of elevation.
If you keep a rifle data book, this becomes a useful reference page. Instead of trying to memorize dozens of odd distances, you learn the major points first and use the 0.1-MIL index to fill in the spaces between them.
The value becomes especially obvious when you apply the system to an actual rifle match.
Start With Your Known 100-Yard DOPE
For this example, I am using the following rifle and ammunition data:
- .223 / .224 projectile
- 2,550 fps muzzle velocity
- G1 ballistic coefficient of .395
- 2.5-inch sight height over bore
- 100-yard zero
- MIL-based optic with 0.1 MIL adjustments
The resulting basic elevation chart looks like this:
| Distance | Elevation |
|---|---|
| 100 yd | 0.0 MIL |
| 200 yd | 0.5 MIL |
| 300 yd | 1.4 MIL |
| 400 yd | 2.5 MIL |
| 500 yd | 3.8 MIL |
| 600 yd | 5.3 MIL |
| 700 yd | 7.1 MIL |
| 800 yd | 9.1 MIL |
These are the first numbers I want to know.
100 / 0.0
200 / 0.5
300 / 1.4
400 / 2.5
500 / 3.8
600 / 5.3
700 / 7.1
800 / 9.1
These 100-yard increments are the hard framework for the rifle's trajectory. Before worrying about 422 yards or 573 yards, I want solid data at 400, 500 and 600.
The Gap Between the Numbers Tells You Something
Now look at how much additional elevation is required to travel each additional 100 yards.
| Distance Band | Additional Elevation | 0.1 MIL Steps |
|---|---|---|
| 100–200 yd | 0.5 MIL | 5 |
| 200–300 yd | 0.9 MIL | 9 |
| 300–400 yd | 1.1 MIL | 11 |
| 400–500 yd | 1.3 MIL | 13 |
| 500–600 yd | 1.5 MIL | 15 |
| 600–700 yd | 1.8 MIL | 18 |
| 700–800 yd | 2.0 MIL | 20 |
The distance is always 100 yards, but the angular correction required to cover that distance keeps increasing.
From 100 to 200 yards, we only add 0.5 MIL. From 600 to 700 yards, we add 1.8 MIL. From 700 to 800, we add 2.0 MIL.
You can see the trajectory changing just by looking at those gaps.
As the projectile travels farther, velocity decreases and time of flight increases. The projectile's descending path becomes progressively steeper relative to the shooter's line of sight. That is why each additional 100 yards requires more angular correction.
Now Divide the Gap Into 0.1 MIL Steps
Once the hard 100-yard points are known, the next step is simple: divide the space between them into the same increments used by the optic.
For many MIL-based optics, that increment is 0.1 MIL.
Take the simplest example first.
100 to 200 Yards
Our hard data says:
100 yards = 0.0 MIL
200 yards = 0.5 MIL
There are five 0.1-MIL increments between those points and 100 yards of distance.
| Elevation | Approximate Distance Index |
|---|---|
| 0.0 MIL | 100 yd |
| 0.1 MIL | 120 yd |
| 0.2 MIL | 140 yd |
| 0.3 MIL | 160 yd |
| 0.4 MIL | 180 yd |
| 0.5 MIL | 200 yd |
That gives us approximately 20 yards of range for every 0.1 MIL in this part of the trajectory.
Now do the same thing farther downrange.
600 to 700 Yards
Our hard points are:
600 yards = 5.3 MIL
700 yards = 7.1 MIL
That is a difference of 1.8 MIL, or eighteen 0.1-MIL increments.
| Elevation | Approximate Distance Index |
|---|---|
| 5.3 MIL | 600 yd |
| 5.4 MIL | 606 yd |
| 5.5 MIL | 611 yd |
| 5.6 MIL | 617 yd |
| 5.7 MIL | 622 yd |
| 5.8 MIL | 628 yd |
| 5.9 MIL | 633 yd |
| 6.0 MIL | 639 yd |
| 6.1 MIL | 644 yd |
| 6.2 MIL | 650 yd |
| 6.3 MIL | 656 yd |
| 6.4 MIL | 661 yd |
| 6.5 MIL | 667 yd |
| 6.6 MIL | 672 yd |
| 6.7 MIL | 678 yd |
| 6.8 MIL | 683 yd |
| 6.9 MIL | 689 yd |
| 7.0 MIL | 694 yd |
| 7.1 MIL | 700 yd |
Now each 0.1 MIL represents only about 5.6 yards of distance.
This is an important part of understanding the chart. A 0.1-MIL adjustment is always 0.1 MIL, but the amount of range represented by that adjustment changes along the trajectory.
One 0.1 MIL Step Does Not Always Equal the Same Number of Yards
| Range Band | Approx. Yards per 0.1 MIL |
|---|---|
| 100–200 yd | 20.0 yd |
| 200–300 yd | 11.1 yd |
| 300–400 yd | 9.1 yd |
| 400–500 yd | 7.7 yd |
| 500–600 yd | 6.7 yd |
| 600–700 yd | 5.6 yd |
| 700–800 yd | 5.0 yd |
At the beginning of the trajectory, a tenth can cover a relatively large amount of range.
By the time this rifle reaches 700 to 800 yards, that same 0.1 MIL represents roughly five yards.
That is the connection between the basic 100-yard chart and the more detailed 0.1-MIL index.
The 100-yard chart gives you the hard reference points. The tenths give you a practical way to navigate the space between them.
The 0.1 MIL Chart Belongs in the Data Book
I would not necessarily try to memorize every line of the complete 0.1-MIL table.
Instead, put the master chart in your rifle data book.
The hard 100-yard numbers are what you should work toward memorizing. The full 0.1-MIL table then becomes a reference tool.
When you receive a stage description or range card with odd target distances, you can quickly convert those distances into practical elevation holds.
That is where this becomes more useful than a normal drop chart.
Applying the Index to a Real Rifle Match
Consider several stages from a Geissele Gas Gun match at Coleman's Creek.
The target distances were not conveniently placed at 100-yard increments. They included targets at 462, 422, 619, 573, 480 and 630 yards.
Those are exactly the kinds of distances where the 0.1-MIL reference becomes valuable.
Stage 1
Target distance: 462 yards
Look at the 400–500 yard portion of the reference chart:
| Elevation | Distance Index |
|---|---|
| 3.2 MIL | 454 yd |
| 3.3 MIL | 462 yd |
| 3.4 MIL | 469 yd |
The stage target lands directly on our 3.3 MIL index.
Our stage note becomes simple:
462 → 3.3
Stage 2
The stage has three distances:
422, 619 and 573 yards.
| Target Distance | Nearest 0.1 MIL Index | Reference Yard Line |
|---|---|---|
| 422 yd | 2.8 MIL | 423 yd |
| 619 yd | 5.6 MIL | 617 yd |
| 573 yd | 4.9 MIL | 573 yd |
Instead of searching through a ballistic application during stage preparation, the reference card gives us:
422 → 2.8
619 → 5.6
573 → 4.9
Notice that two of the targets are not exactly on the indexed yard line. The 422-yard target indexes to approximately 423 yards, and the 619-yard target indexes to approximately 617 yards.
That is why this is a reference system rather than a replacement for verified ballistic data. The 0.1-MIL increment is the resolution of the optic, so we are identifying the closest useful elevation index.
Stage 3
Stage 3 gives us:
400 and 100 yards.
These targets fall directly on our original hard 100-yard data.
| Target Distance | Elevation |
|---|---|
| 400 yd | 2.5 MIL |
| 100 yd | 0.0 MIL |
This demonstrates why the original chart remains the foundation.
The detailed 0.1-MIL table does not replace the hard indexes. It grows out of them.
Stage 4
Stage 4 has:
480 and 600 yards.
| Target Distance | Nearest 0.1 MIL Index | Reference Yard Line |
|---|---|---|
| 480 yd | 3.5 MIL | 477 yd |
| 600 yd | 5.3 MIL | 600 yd |
Again, one target uses the detailed index while the other lands directly on a hard 100-yard reference.
480 → 3.5
600 → 5.3
Stage 5
Stage 5 has:
630 and 325 yards.
| Target Distance | Nearest 0.1 MIL Index | Reference Yard Line |
|---|---|---|
| 630 yd | 5.8 MIL | 628 yd |
| 325 yd | 1.7 MIL | 327 yd |
The stage card becomes:
630 → 5.8
325 → 1.7
Now Look at the Entire Match
Put the stages together and the usefulness of the reference chart becomes easier to see.
``` ```
| Stage | Target Distance | Elevation Index |
|---|---|---|
| Stage 1 | 462 yd | 3.3 MIL |
| Stage 2 | 422 yd | 2.8 MIL |
| Stage 2 | 619 yd | 5.6 MIL |
| Stage 2 | 573 yd | 4.9 MIL |
| Stage 3 | 400 yd | 2.5 MIL |
| Stage 3 | 100 yd | 0.0 MIL |
| Stage 4 | 480 yd | 3.5 MIL |
| Stage 4 | 600 yd | 5.3 MIL |
| Stage 5 | 630 yd | 5.8 MIL |
| Stage 5 | 325 yd | 1.7 MIL |
Now the match is no longer a collection of unrelated distances.
It becomes a series of recognizable locations on the rifle's elevation curve:
462 → 3.3
422 → 2.8
619 → 5.6
573 → 4.9
400 → 2.5
100 → 0.0
480 → 3.5
600 → 5.3
630 → 5.8
325 → 1.7
That is the practical value of the 0.1-MIL index.
The Master Chart Is Not Necessarily Your Stage Card
There is an important distinction here.
The complete 0.1-MIL chart is the master reference.
It belongs in the data book and helps you prepare the actual information you need for a specific course of fire.
You probably do not need all 90-plus values visible while shooting a stage.
Instead, use the master chart to create a much smaller stage card.
For example, Stage 2 only requires:
| Distance | Elevation |
|---|---|
| 422 yd | 2.8 |
| 573 yd | 4.9 |
| 619 yd | 5.6 |
Three numbers.
That information can go on a stage card, wrist coach, rifle-mounted card or whatever system the shooter prefers.
The large chart did its job before the stage started.
Build the Chart in Layers
The easiest way to organize a data-book page is to visually separate three types of information.
1. Hard 100-Yard Indexes
Highlight these first:
100, 200, 300, 400, 500, 600, 700 and 800 yards.
These should be the numbers you verify and work toward memorizing.
2. Whole-MIL Landmarks
Whole-MIL values also make excellent reference points:
| Elevation | Approximate Distance |
|---|---|
| 1.0 MIL | 256 yd |
| 2.0 MIL | 355 yd |
| 3.0 MIL | 438 yd |
| 4.0 MIL | 513 yd |
| 5.0 MIL | 580 yd |
| 6.0 MIL | 639 yd |
| 7.0 MIL | 694 yd |
| 8.0 MIL | 745 yd |
| 9.0 MIL | 795 yd |
These are easy mental landmarks.
For example:
5 MIL ≈ 580 yards
6 MIL ≈ 640 yards
7 MIL ≈ 700 yards
3. The 0.1 MIL Working Indexes
Everything between those highlighted points is the working reference.
You do not necessarily need to memorize every tenth. The chart lets you find it quickly when you need it.
A Reference Chart Is Only as Good as the Data Behind It
The numbers in this article begin with calculated ballistic data.
Your final chart should be built from the rifle you actually shoot.
If your calculator predicts:
600 yards = 5.3 MIL
but repeated shooting at a verified 600 yards tells you the rifle really requires:
600 yards = 5.4 MIL
then 5.4 becomes your hard data point.
The rifle gets the final vote.
Once your known-distance points are verified, rebuild or adjust the intermediate indexes around those numbers.
Factors such as actual muzzle velocity, ammunition variation, atmospheric conditions, sight height, zero quality and scope tracking can all affect the final result.
Learn the Curve Instead of Memorizing Random Numbers
The purpose of this exercise is not to memorize a giant spreadsheet.
It is to organize ballistic information in a way that helps you understand the rifle.
Start with the hard 100-yard DOPE:
100 → 200 → 300 → 400 → 500 → 600 → 700 → 800
Understand the growing elevation gap between those distances.
Then divide those gaps into the 0.1-MIL increments your optic already uses.
Now a target at 619 yards is no longer an unfamiliar number.
You know that 600 is 5.3 MIL. You know 6 MIL is around 640 yards. Your reference chart places 619 at approximately 5.6 MIL.
A 462-yard target is not another completely different ballistic problem.
It is simply the 3.3-MIL location on the same trajectory you have already been learning.
That is the real purpose of the chart:
Hard 100-yard DOPE establishes the trajectory. The 0.1-MIL index fills in the gaps. Your data book turns both into a practical match reference.
