1B,
Yes, with most lower power scopes your positioning would be about right for me. From where the yellow line is would put the position you describe at around 3.75 to 4 inches. What I don't like on a larger rifle is for the eye relief to change. Some of the 2-7x Leupolds will change eye relief about an inch from low to high power.
The Omega gives you a bit more room between eye and scope plus it has the same eye relief at any magnification.
