Rail Mount

How to adjust my scope if it is off by 1 foot?

My rifle is shooting about 9 inches lower than my scope is set to at about 25 feet. How do I make this extreme of an adjustment on my scope? Obviously the windage and elevation nobs will not make this extreme of an adjustment.
PS: I am using a Center-Point 3-9X40 scope on a weaver rail mount.
The gun is a .22 caliber Benjamin Trail NP XL (It's an air rifle, not a regular one.)
I probably do need to reinstall it. Now that I come to think of it, I never used a torque-wrench to put the scope on, I just used a regular allen-key, so I probably didn't equalize the tension on all 8 screws for the 2 mounting rings.

My rifle is shooting 9 inches low at 25 feet?
Your air rifle has "barrel droop"

http://www.pyramydair.com/blog/2006/01/barrel-droop.html

http://www.pyramydair.com/article/Scope_shift_and_barrel_droop_two_common_problems_March_2008/46

Do NOT over adjust your scopes elevation, this can float the reticle.

The solution = An adjustable mount or rings**

http://www.pyramydair.com/blog/2006/01/adjustable-scope-mounts.html

**it would be best to talk with an expert from Pyramyd AIr as to which would work best with your rifles Weaver rail.

How to mount an airgun scope.

http://www.pyramydair.com/article/How_to_mount_a_scope_Part_1_October_2008/53

Benjamin Trail NP XL
video

Rick has some useful info

Check to make certain all your rifles stock screws are good and tight.

Final sight in range for a .22 caliber NP XL
I assume your rifle delivers around 890fps with 14.3gr Crosman Premiers
If you sight in at 40 yards
Hold over/under - ft-lbs of energy
10 yards = - 0.62in / 22.76ft-lbs
20 yards = + 0.14in / 20.6ft-lbs
30 yards = + 0.37in / 18.64ft-lbs
40 yards = + 0.00 / 16.86ft-lbs
50 yards = - 1.02in / 15.26ft-lbs
60 yards = - 2.77in / 13.81ft-lbs
+ = above line of sight
- = below line of sight
That gives you a relatively flat trajectory for the useful range of your rifle.

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