Currently Burris does not offer a 7400 mount. Here is one we located on Optics Planet.
https://www.opticsplanet.com/talley-picatinny-base-for-remington-4-6-74-76-750-7400-7600.html
Hands down we always recommend the Burris Signature rings.
https://www.opticsplanet.com/v/420587-burris-signature-zee-30mm-riflescope.html
I would recommend using a 1-piece 30mm scope mount designed to work on AR pattern rifles such as the Aero Precision Ultralight 30mm Scope Mount, or Vortex Sport Cantilever 30mm Rifle Scope Ring Mount. Both options can be found linked below:
https://www.opticsplanet.com/aero-precision-ultralight-30mm-scope-mount-spr.html
https://www.opticsplanet.com/vortex-30mm-cantilever-riflescope-ring-mount-for-ar-15.html
The Burris 3-12x56 is made in China.
If you do not have a picatinny rail base, I would recommend using the GG&G Ruger Mini-14/ Mini-30 Ranch Model Picatinny Scope Mount (linked below), paired with a set of high height scope rings to allow for clearance of your objective lens. Both the picatinny mount and scope rings can be found linked below:
https://www.opticsplanet.com/gg-g-ruger-mini-14-mini-30-ranch-model-picatinny-scope-mount.html
https://www.opticsplanet.com/trybe-optics-advanced-scope-rings.html?_iv_tube-diameter=30-mm&_iv_ring-height=high
Yes, the Aero Precision Ultralight Scope Mount will provide enough clearance for the (56mm) objective lens of this scope on an AR pattern rifle.
The W/E Travel at 100yards is referring to the Windage and Elevation adjustment.
The Burris Fullfield IV 3-12x56 mm 30 mm Tube Second Focal Plane (SFP) Rifle Scope has capped low profile turrets.
Yes, this Burris Fullfield IV 3-12x56 mm Rifle Scope would work well on a 300 Win Mag for hunting.
You will want Extra High height rings.
The only part that will be illuminated is the small cross in the center.