I just purchased a new Vortex Diamondback HD 4-16x42mm scope. I installed the rings, bases and torqued all the screws as per the manufactures guidelines. I levelled the scope with a scope level and bore sighted it. I went to the range today and used the same reloads that I shot with my previous scope which produced the target below. The results today weren't even close, so my question is, how does a rifle using the same ammo, bench rests, outside temp. shoot worse in less than a month?