Cap cover pentax 3x-9x scopes - Pentax 3X - 9X 40mm Lightseeker XL Glossy Rifle Scope

Let's rewrite as

7(3x+5) = 8x -1(1-4x)
Let's distribute
21x + 35 = 8x -1 + 4x
collect like terms
21x + 35 = 12x -1
Put all the x's on one side by subtracting 12x from both sides
21x -12x + 35 = 12x -1 -12x
simplify
9x + 35 = -1
get all the constants on the right side
9x + 35 - 35 = -1 - 35
9x = -36
divide both sides by 9 to get x by itself
9x /9 = -36/9
x = -4

check in original equation

7(3(-4)+5) = 8(-4) -(1-4(-4))
7(-12+5) = -32 - (1+16)
7 (-7) = -32 - (17)
-49 = -32-17
-49 = -49

Download the appropriate manual from here: http://simmonsoptics.com/global/manuals.aspx

The Winchester 94 ejects the spent cartridge straight up and out of the top of thr receiver. This nesesitates mounting a scope off to the side to avoid jamming the action with a spent case hitting the scope and failing to clear the action.

Did a search of the Pentax support site for your Scope. They do not offer on their site a download manual. But I did get their contact info for you. Give them a call to see if they will help you with this info. Hope this helps Fix Ya up.
PENTAX Customer Care
Toll Free: (800) 877-0155
Phone: (303) 799-8000

y = 3x + 2

Most scopes of this type move the bullet impact 1/4 inch at 100 yards, or 1/4 minute of angle.

1. Step 1 Take a rifle with a properly installed BDC bullet drop compensating reticle to a rifle range. Using ear protection zero the scope reticle so that the point of impact corresponds to the center of the cross hairs at the distance you have selected - typically 100 or 200 yds.
   
2. Step 2 Determine the trajectory of the specific cartridge you have selected. There are several ways to do this. Ammo manufacturers publish trajectory and wind drift information. There are web based ballistic calculators like http://www.biggameinfo.com/BalCalc.aspx which will tell you how much your bullet drops at known distances.
   
3. Step 3 Scope manufacturers like Leupold can be a valuable source of information about their reticle: "Leupold® Ballistic Aiming System: Boone and Crockett Club® Big Game Reticle aiming system provides a series of additional aiming points to improve your ability to shoot accurately at longer ranges. Nikon also provides good information suggesting the marks on their reticle be used for zero at 100yds followed by circles below representing 200, 300, 400 and 500 yds if the cartridge travels around 2800 ft per sec. Nikon suggests the center cross hair be zeroed at 200 yds for magnum calibers traveling around 3000 ft per sec. We understant that each variation of different bullet weight and powder charge changes trajectory and a scope manufacturer can not build a different reticle for each different cartridge made so practice on the range to determine how well the marks relate to the actual impact of where your bullet strikes at a know distance is important. The one thing that people using BDC scopes typically have problems with is that a BDC scope has the reticle in the second focal plane of the scope. If the reticle was in the first focal plane of the scope the reticle would look smaller on low powers like 3x and grow proportionately larger as the power increased to say 9x top power. The problem is that while the marks on the BDC reticle correspond accurately to the bullet drop at the know distances 200, 300yds etc. What happens when you lower the power from the scopes maximum power to any other lower power is the reticle stays the same size and the field of view within the scope increases which means that the distance between these marks on the BDC reticle no longer corresponds to the point where the bullet will strike. In short BDC reticles only work at the maximum power of the scope or at a set specific power. At all other powers these BDC reticles do not accurately represent where the bullet will strike.
   
4. Step 4 The center X always remains the same. If you zero at 100 yards and you know that your bullet drops 8 inches at 300 yards you could forget about the BDC marks and hold the center X 8 inches high - that works at any power 3x or 9x and should be used at lower powers. If you zero the center crosshair at 100yds and have the BDC scope at the maximum power 9X then the first line or circle below the center X should be the mark you place on the center of the 200 yard target----- the bullet strike should hit the center. If by some chance you put the scope on 3x and placed that first mark below the center cross hair on that 200 yard target you would shoot over the top of the target. This is because as the power of the scope decreases the field of view increases the angle increase and gets wider. You can experiment with known power settings and see at a specific power say 3x what that first circle down corresponds to and make notes because at any set power what the marks correspond to will be repeatable.
   

I got this from a website, hope it helps.

I'm not familiar with the scope, is it an air rifle scope? One stroke type? If not, the backwards recoil of the air rifle is tough on a normal scope, they aren't made for that type of abuse. They work fine with a normal recoil. That is why they started making air rifle scopes. I'm sure that the internals of your scope are damaged somewhat, you can take off the eyepiece no problem, you might find something in there, loose screw, missing screw, you never know, don't get too carried away with the dis-assembly, you'll never get it back together. It sounds like the magnification ring is messing with the focus of the eyepiece. Might just need some oil. Hope this helps.

Either the scope is damaged or a screw is missing.
Contact Bushnell below: United States
Bushnell Corporation
9200 Cody
Overland Park, KS 66214-1734
Kansas City area - (913) 752-3400
Consumers - (800) 423-3537
Dealers - (800) 221-9035
Fax - (913) 752-3550
Canada
Bushnell Corporation of Canada
25A East Pearce St.
Richmond Hill, Ontario L4B 2M9
Local Phone - (905) 771-2980
Other - (800) 361-5702
Local Fax - (905) 771-2984
Other Fax - (800) 661-3254