You will essentially match the regular rifle sight to a mounted scope sight through the process of bore spotting.Regardless of whether or not you have the scope on, your rifle will be seen accurately.For no extra cost, you can do it at home.For more information, see Step 1.
Step 1: If you haven't already done so, put the scope on the rifle.
If you don't already have scope mounts for your rifle, you will need to.Most modern rifles come with a pre-drilled screw hole for scope mount installation.Make sure the mounts are secure.After your mounts are installed and hardware is tightened, you should leave scope rings on the scope to adjust their position.You will need to be able to move the scope back and forth after mounting it on the rifle.The horizontal line on the reticle needs to be adjusted so that it is level.The eye relief on the scope needs to be adjusted.While keeping the gun in a comfortable shooting position, move the scope forward or backwards until there is no black ring around the objective.It's important that you have enough eye relief so the scope won't hit your face.
Step 2: A target can be created.
A bright red dot can be used for bore-sighting.It needs to stand out and be clearly visible with both types of sights, so it helps to use something very specific with high contrast, roughly 100 yards away for the optimum sight.You're not going to be shooting at the target, just lining up the sights, so this is a perfectly fine thing to do indoors.Double checking to make sure that your gun is unloaded before you try to bore sight it is a good way to practice gun safety.
Step 3: If you want to shoot the gun, line up the front sight with the target.
A gun vise is ideal for the job, but any kind of bench or stabilizer would be helpful for keeping the gun level while you make the adjustments.Keep the gun level by getting a good sight picture with the front sight.
Step 4: Take the scope and line it up.
Line up the cross-hairs on the scope with the target and keep a good sight picture after the sight is leveled and the eye relief is set.When adjusting the elevation and windage on the scope, make sure it's lined up as closely as possible.At the same time you could look through the scope at the appropriate distance and be lined up with the exact same spot, you were looking for a perfect sight picture.It's very difficult to do this without a gun vise or some other kind of stabilizer, so you can make your adjustments without holding or moving the gun.
Step 5: There is a rifle at the range.
Take your rifle to the range and shoot a few practice rounds to get the feel of the scope and make small adjustments as necessary.No matter how accurate the gun is, take some time to get used to it and sight it in correctly.