Had several German 8x56 scopes over time attached to 243 rifles for shooting hinds and anything else needed during daylight hours, very easy on the eye and user friendly but a tad bulky after a fixed x6 but you’d never really notice at the time.
On deer rarely go past 200 yards and could the same job with a fixed x4 power no problem, real world range would depend on so many factors and what you are trying to achieve and caliber using, good rest little wind and x8 power scope in theory and practice many things possible if playing.