The criteria I apply for heavy recoiling/dangerous game/plains gave rifles are:
- Must be quick to pick up the target.
- To me this means low power at the bottom end for both eyes open target acquisition.
- An illuminated reticle to pick a spot in a dark mass when the dark cross hairs blend in.
- Top quality optics. With high end optics not only is the brightness better but you can be a precise shooter with less scope power as the image is much sharper.
- Low mounting to pick up a good cheek weld that is directly behind the scope. I love the Swaro Z6i scopes for my single shots but their large ocular housing means they must be mounted high on bolt action rifles. For me, I do not get a good cheek weld with a Z6i. The Zeiss Victory HT I have on rifle monts over an eighth of an in lower than the Z6i did. The Zeiss gives a good cheek weld and less perceived recoil as the stock does not slap the face as hard when the rifle has less of a running start (Dynamic overshoot) at your cheek.
- Not only should the ocular be as small as possible for mounting but it should not form a wide ring of blocked vision area between the scope image and the outside world. IE: The vision portion of the ocular housing should be both optically and physically small.
For the above reasons the scope i have on my 416 Rigby is a Zeiss Victory HT 1.5-6. With the clarity of the optics 6x is more than adequate for a 300 yard shot and the scope is mounted very low.
As we say in Engineering design, good design is a study in compromises and no two individuals will chose the same compromises. Those compromises are what make scope selection interesting.