It sounds like your scope and stock are not adjusted correctly for your face.
Try a couple of things...
1. Shoulder the rifle so it fits right and get a good cheekweld. Have somebody observe your line of sight.
2. Your eye needs to be EXACTLY in the center of the scope. If you are looking up into the scope (or looking down), you won't get a good sight picture.
3. If you are looking down, try a taller set of rings.
4. If you are looking up (the most common problem) then try raising your cheek. For test fitting I cut a mouse pad up into thirds and wrap it around the the stock where my cheek rests. Masking tape will hold it in place. Add a second or sometimes even a third layer if necessary. If this works, buy an adjustable cheek rest. (about $35)
5. Vertical alignment HAS to be correct FIRST.
6. Once vertical alignment is correct, move your head forward and back. If this clears up the sight picture, loosen your rings just a little and slide your scope forwards or back. If you can't, ditch the scope and buy one with adjustable eye relief.
7. Be very careful not get the scope TOO close to your eye. Having your eyebrow cut open from the scope recoil hurts.
Personally I would not buy a BSA scope, I have never seen one that would stand up to the recoil of a high powered rifle. You would sight them in and then 50 rounds later, they drift off.