Rifle Scope Mounting And Measuring Scope Mount Height:
Written by: Kim Lockhart, Copyright.
Proper Rifle Scope Mounting:
We will start from scratch here. A brand new remington 700 bolt action rifle, millett two piece windage adjustable scope bases, millett scope rings and a leupold 3-9 variable power scope. Fairly common hunting rig. Now lets mount the scope on the rifle the right way to achieve the rifles full accuracy potential. If you follow this rifle-scope mounting procedure exactly it will be impossible to cant the rifles scope therefore adding the potential for better rifle accuracy.
1. Mount the rifle in a padded vise as far away from a wall opposing the muzzle end of the rifle, the farther away the better.
2. Attach the scope mount base to the rifle securely.
3. Now take a level and lay it on the base horizontal to the rifle bore. Level the rig out in the vise and lock it down.
(See Image Below)
4. Attach the scope rings, make sure the scope will lay down into the rings without them moving when you go to tighten the scope into the rings.
5. Now take the scope and put it between 2 v blocks and spin the scope watching the crosshairs for wobble, adjust the scope to insure there is no wobble in the crosshairs, this is critical to your long range rifle accuracy.
6. Check to make sure that your rig is still level in the vise and then set the scope in the rings.
7. On the opposing wall away from the rifle muzzle draw a vertical and horizontal line, again using a level to insure that the line is plumb vertically and level horizontally. It should look like a plus sign.
(See Image Below)
8. Remove the bolt from the rifle, looking through the rifles bore, center the plus sign in it. If you can't remove the bolt use a laser chamber boresighter only.
9. Do not use the windage screws on the scope for this procedure. Align the vertical post in the scope with the vertical line on the wall using only the windage screws on the scope base and tighten down the scope rings, make sure that all stay level and plumb vertically and horizontally.
10. If you have done everything correctly, you have just mounted the scope to all the exact tolerances that have been machined into all the scope mount components. Everything to its true and exact mechanical center point. Your rifles scope is now properly mounted and is range ready for a Accurate Sight-In.
Measuring Scope Mount Height:
A good stainless steel 6" dial caliper will deliver unfailing .001" accuracy for checking outside and height measurements and is the precise tool needed for this job.
Note: This works for almost all rifles regardless of action type.
Step 1. Measure the rifle barrel diameter where it attaches to the rifles action under the scope and divide it in half.
Step 2. Measure the scope diameter directly over-top of where you got barrel diameter measurement and divide it in half.
Step 3. Measure the distance from the top of the rifle barrel to the bottom of the scope on the rifle where you measured both diameters.
Step 4. Add the numbers in steps 1-3.
Step 1. + Step 2. + Step 3. = Step 5.
Step 5. Answer is rifle bore centerline to scope centerline distance or "Scope Mount Height".