Attach the Scope to Your Rifle
The first and most obvious step is attaching the scope to your rifle. Nearly all modern rifles have a mounting system integrated into the receiver, usually a Picatinny rail. You might also find pre-drilled and tapped holes used for attaching scope bases. You will want to ensure the scope rings fit your specific scope or brand. Certain scope rings will only fit specific types of bases. If you are using a Redfield scope on your rifle, your rings should fit Redfield scopes.
Remove the Bolt
Bore sighting is a simple, straightforward process. The first step is to align the barrel, or bore, and the optic with the target. To do this, you first need to remove the bolt or bolt carrier group. In bolt-action Browning rifles, for example, this is easy. AR-style rifles might be slightly more complex, and you may need to perform a few extra steps.
Keep the Rifle Stable
You will want to use sandbags or a sight-in vice and a sturdy bench to stabilize your rifle. This may be harder in a rifle like a DPMS 308 Oracle, as you will need to stabilize the upper receiver first. Then, after the next step, close the lower while keeping the upper stabilized. Keeping the rifle stabilized is crucial to be sure it does not move around while you are sighting it in.
Align the Bore with the Target
After you have the rifle stabilized, look straight through the bore. Line the bore up with the target, which should be set your desired zeroing distance. If you want your zero distance to be 200 or 300 yards, such as for target shooting or hunting, start at 50 or 100 yards first, and work your way out to the desired distance.
Align the Scope
With the bore aligned and being careful not to touch the rifle, look through your scope. This can be tricky, as you will not be able to get into your normal shooting position with your cheek on the stock. You should be able to see through the scope to see where the reticle is pointed. Align the center of the target with the scope by adjusting windage and elevation.
Fire Three-Shot Groups
Now, it is time to test the rifle. Reassemble the rifle and take a test shot. Adjust windage and elevation again, as needed. Then, shoot in three-shot groupings. Keep adjusting until you are satisfied with the scope.
Zero the Scope
Finally, set the dials on the scope to the zero marks, now factoring in your adjustments. You are now finished zeroing in your scope, and your rifle is ready for the next time you plan to go to the range or take it on a hunting trip.
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