To install the mount, you’ll tighten the screws into the mounts according to the manufacturer directions. It’s best to proceed in an X pattern, so that you are not pulling the scope one way or the other. Start the screws loosely at first, so you can make adjustments if necessary.
Imagine a line through the cross-hair that runs directly through the center of your rifle. You can make further adjustments later, but it’s important to get the cross-hairs oriented in the correct position now, before you tighten it down.
Use a bulls-eye target specifically for zeroing. These will typically have lots of measurements that will let you make accurate adjustments on the rifle. The more sure how “off” each hit is, the more accurately you’ll be able to sight it in. Follow the specific regulations and rules at the range at which you’re shooting.
If you don’t have a solid gun rest, get in as solid a position for shooting as possible. Even just setting up a couple of steady books, or your boots, or your jacket, will help you to rest the gun on something and shoot more accurately. Just make sure whatever you’re resting it on is clear of the bolt.
Once you’ve made your adjustments, repeat this process. Fire a few more rounds, check the grouping, and readjust. That’s the process. It’s a good idea to mark the holes in the target that you’ve already made, so you don’t get confused later, or to use a new target. Some targets come with four or five different bullseye, just for this process.
Start at 20 yards (18. 3 m), then move out to about 75. Try not to move more than 50 yards (45. 7 m) at a time, to keep yourself making little adjustments. If you have time and feel like you could still make more adjustments, you can move into the 200–300 yard (180–270 m) range and get ambitious. At that point, however, wind will be a big factor. [10] X Research source
On some older sights, you’ll need to use a penny or a small key to turn the knobs gently, though on most sights you can just use your fingers to twist the knob, like a dial.
Once the gun has been bore sighted and is ready to shoot you should still test it yourself using these directions and make the necessary adjustments. Some difference will come from different user variables.
