How to shim a rifle Scope?

How to Shim a Rifle Scope: A Step-by-Step Guide

When adjusting a rifle scope, finding the perfect zero can be a challenging task. Often, the scope’s adjustable screws are not enough to bring the point of impact on target. This is where shimming comes in. Shimming a rifle scope involves placing small, precision-cut shims between the scope and the rifle to adjust the scope’s mounting position and ensure a consistent point of impact.

In this article, we’ll walk you through the process of shimming a rifle scope, covering the types of shims available, how to measure your rifle, and step-by-step instructions on how to apply the shims.

Why Shim a Rifle Scope?

Before we dive into the process, it’s essential to understand why shimming is necessary. Rifle scopes are designed to mount on specific rail systems or bases, which can affect the scope’s position on the rifle. The combination of these factors can cause the scope to be positioned slightly off-center or even tilted, leading to accuracy issues.

Types of Shims

There are several types of shims available on the market, each designed for specific uses:

• Flat Shims: These are thin, flat pieces of plastic or metal used to raise or lower the scope on the rail system.
• Angled Shims: These are used to adjust the scope’s mounting position and are designed to fit specific angles.
• Ring Shims: These are used to raise or lower the scope rings on the scope and rifle.
• Adjustable Shims: These can be adjusted to specific measurements to provide a custom fit.

Measuring Your Rifle

Before applying shims, it’s essential to measure your rifle and scope to determine the amount of adjustment needed. Use a tape measure or a precision measuring tool to take the following measurements:

Step-by-Step Instructions

Once you’ve taken your measurements, follow these steps to shim your rifle scope:

1. Determine the correction needed: Based on your measurements, determine the amount of correction needed to zero your scope. If the scope is too high or too low, you’ll need to use flat shims. If the scope is tilted, you’ll need to use angled shims.
2. Choose the correct shim material: Select the type of shim material that best fits your needs. For flat shims, plastic is a good choice. For angled shims, aluminum or steel may be preferred.
3. Apply the shim: Place the shim on the rail system or mounting plate, depending on the type of shim used.
4. Adjust the scope: Once the shim is in place, adjust the scope’s mounting position until the desired zero is achieved.
5. Re-zero the scope: Repeat the process of adjusting and re-zeroing the scope until the desired point of impact is achieved.

Tips and Tricks

When shimming a rifle scope, keep the following tips in mind:

• Start with small adjustments: Begin with small adjustments to the shim and gradually work your way up to ensure accurate zeroing.
• Use a precision-measuring tool: A precision-measuring tool will provide more accurate measurements, making it easier to achieve the desired zero.
• Consult the manufacturer’s guidelines: If you’re new to shimming, consult the manufacturer’s guidelines for specific instructions and recommendations.

Conclusion

Shimming a rifle scope can seem daunting, but with the right measurements and shims, you can achieve accurate zeroing and improved rifle performance. By following these step-by-step instructions and tips, you’ll be well on your way to customizing your rifle scope and achieving the desired point of impact. Remember to measure carefully, start with small adjustments, and consult the manufacturer’s guidelines for a stress-free shimming experience.

Common Shim Dimensions and Measurements

Here are some common shim dimensions and measurements to help you get started:

Note: These measurements are general guidelines and may vary depending on the manufacturer and specific application.