Tuning you're broad heads to shoot the same or very close to you're field points. Technically speaking you could shoot bullseye's with field points, throw on a broad head and watch it spin out of control all over the place and end up a foot low and 7inches right. You're bow needs to be "IN Tune- True- Setup perfectly" for good broad head flight. There are many ways to do this, paper tuning.. I feel somewhat not needed to an extent. Walk back tuning is also very effective, I don't wanna go into great detail as you can youtube walk back tuning and get the idea really easily. If broad head is left, move your rest in very small increments to the right until your on at 20 yards, then work your way back. Many many you-tube video's on how to broad head tune, From my experience some broad heads fly differently then others, both fixed and expandables.
