Eye relief is the distance between your eye and the ocular lens of the scope. For the most part the higher you go in magnification the more critical the eye relief is. Low powers such as 1-2.5 will have a generous ones. Most rifle scopes will have3-5 inches of relief. As you are very well aware on heavy recoiling guns you need enough so as not to cause injury.

I am not sure of the question exactly here but if the scope you are usinghas enough eye relief and you are having to crawl the stock to get a good sight picture I would install a set of extension rings so it will move the scope towards you thus preventing you to move your head forward.