I have read before that a 40mm objective scope with good coatings is just as good, if not better, than a 50 mm objective scope with slightly lower quality coatings. My questions is: With the new "high tech" coatings of the VX3, is a 4.5-14x40mm scope a better choice than a good 4.5-14x50mm scope? It will go on a custom built 7mm SAUM deer/antelope killing machine. I was dead sent on a 4.5-14x50mm from Grey Bull, but I'm checking out other options. Any advice?