I bought a pack of rage crossbow heads. Sighted my crossbow in off of a bench and shot half inch groups at 20 yds with the included practice head. Shot better than field points. Tried an actual cutting head and it shot 8 inches to the upper right. Shot the cutting head three times, 2 inch group, 8 inches to the upper right. Scope went bad I figured.
Put the practice head back on, and it went right back to bullseye. Tried the remaining cutting heads, and they flew perfectly. Must have been a fluke bad head, but I lost my faith and returned them.