I used a S&B 6X42MM on my Mod70 .270 Win for twenty years without a glitch. I also use S&B Zenith 1.5-6X 42MM on rifles for some of the larger magnums for elk & moose. The 1.5-6X42MM only weighs about 7 ounces more than the straight 6X. Had zero problems with the two S&B 1.5-6 one is new the other over twenty years and some pretty rough hunts. For hunting a 6X is pretty practical. For me the only advantage a straight 10X would have would be at the range working up loads. My take is a 2.5-10 or 3-9 in a quality scope like a S&B fits most hunting conditions, that is why they are so popular. I like the 6X but I am not one to change scopes on and off rifles for range and hunting use. Also the S&B Zenith 1.5-6X42 is just short money more than the straight 6X. I also have a S&B Zenith 3-12x50 MM illuminated and a 1.1-4X24mm illuminated. I also like Leupolds and have used them on many of my most memorable tough conditions hunts without any problems.
