This is a super generic answer, but I'd say any low power variable scope from a reputable manufacturer with minimum magnification of 1x, an illuminated reticle, decent eye relief (>3.5in), mounted in quick detach (QD) rings.
On this site you'll see or hear about lots of .416 (and bigger) rifles mounted with a Leupold VX3 or VX5 in 1-5x, Swarovski z6i 1-6x and z8i 1-8x, Leica Magnus or Amplus in 1-6x, Trijicon Accupoint in 1-6x, and there are comparable 1-Xx scopes from Zeiss, Schmidt & Bender, Steiner, Kahles, etc. Talley, Warne, and Leupold QD rings are often mentioned.
Swarovski did make a 1-6x with extended eye relief (EE) for heavier recoiling rifles, but I believe they are no longer in production. They occasionally pop up for sale but are usually sold at a premium. Many on this site with more experience have proclaimed it as the best dangerous game scope ever made.