If you want to calculate your DOPE, you will need to measure the scope height. Although it may sound complicated and time-consuming, it is actually a very simple process. Even better is the fact there are 3 different ways you can get the value. Today, we will teach you how to measure scope height using these methods. There are several variations, and all of these will be covered below.


The simplest method

If you want to know how to measure scope height in the simplest way, you need to check out this section. All you have to do is measure the distance from the center of scope (you can use scope rings as well) to the center of the barrel. This method gives a decent measurement[1]https://en.wikipedia.org/wiki/Measurement, and it can be completed within seconds. A downside is its accuracy—it isn’t the most precise approach, and it depends on your level of skill. Luckily, there are other techniques you can use, which are more accurate.


Cleaning rod method

The second method is a bit more accurate but still based on the same process. Here, you need to remove the bolt of your firearm. Use a cleaning rod to get the centerline of the barrel. Now, measure the distance between the center of the cleaning rod to the center of the scope or the scope rings. This measurement is more accurate than the first-case scenario but less accurate than the third method.

Also Interesting: What does 4×32 scope mean.


The formula for measuring the scope height

How to measure scope height

The last method is the most accurate and can be used by professionals. It is based on a formula and is a bit more complex. You will need some time to get used to this and make sure all the figures are accurate. . To keep things as easy and simple as possible, we will present all the steps you need to take.

  1. The first thing to do is measure the bolt diameter. When done, divide it in half.
  2. Measure the scope diameter and also divide it in half.
  3. Measure the distance between the bottom of the scope to the top of the bolt.
  4. Add the numbers you got from steps 1-3.

The formula will look like .348 + .591 + .75 = 1.68. This example can be used for the Remington 700 and Leupold Mark 4 M1 combination. To ensure your scope height is accurate, you need accurate numbers. You can use a caliper. The best option is a digital caliper because it is the most precise. There are other options available, but they may be more expensive or less exact.

Read More: 30mm Scope Rings.


Which scope height do I need?

In most cases, you will need a scope height between 1.5 and 1.8 inches. The distance is obviously between the center of the barrel and the center of the scope or, if you like, scope rings. The goal is the same. In most cases, you need the lowest setting possible. Keep in mind that the scope must not touch the barrel or any other part of the weapon. In some rare cases, usually for tactical applications, a higher scope setting is preferable. When the scope is mounted as low as possible to the rifle, it will provide a consistent picture and help you with your shots. In most examples, a height of 1.5 inches is perfect.

Keep in mind that the scope height is also affected by the power of the firearm and the length of the scope[2]https://en.wikipedia.org/wiki/Firearm. A more powerful rifle will have a stronger recoil, which can damage or even destroy the scope. As such, it should be mounted higher.

Another reason why the scope should be mounted as low as possible is the issue with low cheek rests. They are very low on most rifles, so a hunter won’t feel comfortable while using a cheek rest. This issue is eliminated with the lower scope height. When the scope is too high, you won’t feel comfortable and your accuracy will be affected.

The scope height is determined by the diameter of the scope lens. The most common option is 40 mm. Don’t forget that scopes are generally expressed in millimeters. This scope is mounted as low as possible, except with heavier barrels where the low scope rings cannot be used. The 50 mm scopes are common and popular. They allow more light to penetrate the scope and offer better performance. However, they need to be mounted higher than 40 mm scopes. You will also need a rifle with an adjustable cheek rest. Smaller scopes such as 20–36mm will need to be mounted extremely low using low scope rings[3]https://www.tsa.gov/travel/security-screening/whatcanibring/items/rifle-scope-scope-only.


How does scope height affect trajectory?

Scope height doesn’t directly affect the accuracy, but it does affect the trajectory. Scope height determines the position between the line of sight and the trajectory (the line a bullet makes once it leaves the barrel). The scope should present to you the best point where these two lines meet. Lifting the scope just a few millimeters will affect that point.

In a nutshell, when the scope is too high, your trajectory won’t be affected, but the link between trajectory and the line of sight will be. This can affect accuracy.

Read Next: Types of Scopes.


The final word

Now you know how to measure scope height and why this is a very important process. As you can see, it is extremely simple, and it requires a few minutes of your time. On the other hand, it is essential if you want the most accurate shot every single time. Of the three methods explained above, we recommend the third. It is the most complicated, but also the most accurate and the most appealing.

About the author

Patrick Howard

I have been working as a gunsmith for 20 years. Rain, fog, moisture, high temperature, or even snow are all the things a product must withstand in order to be recommended by me.

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