Self-proclaimed amateur with a Tikka 6.5CM "Rokslide Special" on the way. I've been doing a lot of research on (factory) rounds for whitetail and am unsure if I should be sticking with 129-130 gr rounds or 140-143's. Is the weight spread big enough to impact point of impact out to 300 yards/can I zero with one and use another without an appreciable difference in drop? Thank you in advance.