300 Win Mag w/#4 Contour, 25" Shilen barrel and Rem 700 action. Building for optimum elk/mule deer rifle accuracy and energy up to 800+ yds. Heavily considering Nightforce scope. Questions: 1. Best bullet brand and grain weight for elk/mulies 800 yds (ie- Berger/Barnes 185 gr?). 2. Nightforce: 3.5X15 or 5.5x22? 50mm or 56mm? If 56mm, do I need the medium or high scope mounts? I think the bullet ballistics (velocity) are required to determine which Nightforce reticle is appropriate prior to ordering scope? Thx 4 your time.