I'm shooting Carbon Force 300 arrows with 100 grain heads. My bow is tuned well, and shooting great. With these 100 grain points, my FOC is something right around 7%.

Just for the heck of it I tried some 75 grain heads to see how they would shoot. They actually grouped better! I mean a lot better. I was getting inch and a half groups with the 100's, (3 arrows) with the 75 grain heads, The 3 arrows were all touching on several groups.

How do I explain this?