There are several thoughts on this, but you do need to check what you gun does before shooting at game...
I sightin 2-3 inches high at 100 yards, currently the CoreLokts are 2 inches high at 100...In my rifle they are dead on at about 225, 2 inches low at 250 and about 6 inches low at 300...This is what is important, for a hunter to know off the top of his head where his bullets are landing, and where that deer is standing...I've hunted my farms for over 30 years and just bought a rangefinder a couple of years ago...This helps greatly in making good shots...