As has been stated, the scope is mounted too far back and too high. A PEPR-style mount is not the best fit for a bolt-action magnum, with a shorter eye-relief scope.
Another key point is to ensure that you set the eye relief (i.e. when mounting the scope) at maximum power. This is a common mounting error with variable eye relief scopes - they are mounted on low power, the eye relief is set, and when the shooter dials up the magnification, they are often forced to creep their cheek weld forward, placing them in a sub-optimal position. To avoid this, try setting the eye relief by following these steps:
1 - finger tighten the scope in the rings with just enough tension to allow the scope to be moved,
2 - set the scope to the highest magnification setting,
3 - stand and assume your normal off-hand shooting position,
4 - close your eyes (don't cheat!),
5 - bring up the rifle and assume your shooting position, and most importantly cheek weld, such that it feels comfortable and natural (keep your eyes shut!),
6 - open your shooting eye and see if you have a full sight picture (i.e. no black ring) - do not adjust your cheek weld to correct the sight picture. Stay put!
7 - slide the scope forward or backward until you have a full sight picture,
8 - repeat the process (close your eyes, bring the rifle up, assume your cheek weld, verify sight picture) until you have a full sight picture, at your natural cheek weld.
Note that this is for a hunting, off-hand setup; shooting at max mag off-hand is usually not practical, but if that is how the rifle will be used, then setting the eye relief at that position is a safety consideration. If you will be shooting at max magnification in a prone position, then set the eye relief based on your cheek weld in that position (they can differ greatly).
Another key factor to pay attention to is whether the scope has constant or variable eye relief. Depending on the brand and model, the eye relief will vary considerably:
Nikon Prostaff: 4" at low to 3.6" at high - variable eye relief
Nikon Monach: 3.6" - constant eye relief
Leupold VX2: 4.2" at low to 3.7" at high - variable eye relief
Leupold VX3: 4.5" at low to 3.6" at high - variable eye relief
Sightron SIH: 3.9" at low to 3" at high - variable eye relief
Sightron SII: 4.2" at low to 3.6" at high - variable eye relief
Bushnell 3500/4500/6500 - 3.3" to 4" - constant eye relief depending on the model
Swarovski Z3 - 3.54" - constant eye relief
Swarovski Z5 - 3.74" - constant eye relief
Zeiss Terra - 3.54" - constant eye relief
Zeiss HD5 - 3.54" - constant eye relief
Nightforce SHV - 3.15" at low to 3.5 at high - variable eye relief
Nightforce NXS - 3.5" to 3.8" - constant eye relief depending on the model
All of the above brands and many more (except Sightron) are available from us, at the best prices in Canada.
Hopefully that helps.
Omer