Re: Scopes - Cabela\'s or Leupold
Welcome to the site. Just a few thoughts from my experiences.
First off you need to decide what is long range. If it means inside 500yds, almost any scope will have the internal adjustment to work. If you mean 1000yds and beyond, there are very few choices that are going to "work".
Leupold has some very good optics and if I could not look through the scope, I would choose the Leupold over the Cabela's. However, there are other choices.
Bushnell Elite 3200 and 4200 are the best bang for the buck as far as optics and adjustment (repeatable) go. At least for my eyes. They have the standard amount of adjustment (around 50MOA). If you need more, then the Tasco SS 10X42 is excellent. The Elite 3200 10X is very well priced. Of course, there are the more expensive Leupolds, IOR, Burris, etc long range models.
The AO works just like a camera lens and you must adjust for different distances. This process eliminates parallax error. Of course, a scope with a big bell is going to sit higher off the stock. But if you need the scope, you simply have to adjust the stock to fit.
If you want a walk about rifle, a 3X9 or 2.5X10 is all you are going to need for big game out to 800yds+. Wouldn't want a high mag AO scope on a "hunting" rifle. What happens when the game shows up 50yds in front of you?
For a bench rifle or a varmint gun, a little more mag can help. If the scope has good optics, you will be amazed at how far you can accurately aim with a 10X scope. How about a clay pigeon at 1000yds? For shots way past 1000yds, higher mag is something you can investigate.
Spend some time at this site reading the different posts about hunting styles and equipment. This stuff here is way different then common knowledge. Get a feeling for what you really want to accomplish with your equipment and then the scope choice will become clear.