Here's a tutorial I did several years ago.
After having the scope mounted on your turkey gun, you have to sight it in. Many ways of doing this, but this is how I've done it through the years.
Things you will need:
1. Sandbags/shooting rest. This is a must, as you will need the gun to remain still while you adjust the windage and elevation of the scope
2. Patterning paper, bought usually at a local hardware store, called contractor's paper in 35" width.
3. Some sort of holder for your patten paper. I use large cardboard wedged between to four T post, two per side.
4. 2 3/4" low brass shells and your turkey shells you plan to shoot during season
5. Sharpie marker and/or masking tape.
6. Turkey target (not necessary if you can draw well)
7. Hearing protectors
First set up at 15 yards from your target.
Shoot at mark/tape on target.
Now, here is where you
HAVE to keep the gun still without moving it, unless you want to have to shoot several times.
Place the gun in the sandbags/shooting rest, to where the retical of the scope is on the target you just shot (Point of Aim or POA), and is not needing any help from you to stay on target. If you look real closely, you can see the red dot on the masking tape in the below picture, where I was originally aiming.
Now, with out moving the gun, adjust the elevation of the scope to where the shot/hole is in the target (the point of impact or POI)
Without moving the gun, adjust the windage of the scope to where the target hole is.
Shoot again at a new target, and see where you POI is in location to your POA.
A little off, so I adjust it again using the above steps.
Steady in the bags, retical on the original target/POA.
Adjust the windage of the scope, as this was basically all that was off target.
Shoot again at different target.
Was basically on, a little high, but we are shooting at 15 yards, so I left it at that.
Moved the target to 40 yards now, and added new patterning paper.