This specific riflescope has a second focal plane reticle where the subtensions of the reticle will be true only at 16x max magnification.
The Primary Arms 4-16 x 44 mm Rifle Scope does have a side parallax adjustment, but the manufacturer does not state the range of adjustment. For that information I recommend contacting Primary Arms.
Any 30mm medium mount/rings will work.
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Yes it will, just be sure to use the correct rings/mount for it and your rifle.
Absolutley. With the 4-17x44mm magnification, you will be able to take advantage of the .458 socom caliber. Just be sure to select the correct rings/mount for it.
This scope should be fine and if you run into issues it does carry Primary Arms warranty, but I would probably recommend you look at a higher quality unit from Primary Arms instead of their budget rifle scopes for a .50.
Yes, the riflescope can be used on a center fire rifle with no issue.
Eye Relief is Low magnification: 3.50 in / High magnification: 3.30 in
The red dot in the images is just an add on. You can technically mount a red dot to ANY riflescope with the appropriate mount.