jephthai mentions:
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I'm pretty sure that 'no wind' occurs very rarely across a 600 yard distance.
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It happens frequently before sunrise, it sometimes is dead calm through 1000 yards. Been there, done that shooting a 3.2 inch 20-shot group at 800 yards.
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I spent a good amount of time discussing such things with one of the tuner guys, and he seemed to think that his tuner needed to be adjusted for each bullet due to changes in whip...
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Moving a tuner on a barrel changes its vibration characteristics. What he's doing is changing the barrel's frequency (whip) so for a different bullet's barrel time. He wants the bullet to exit at the best place for best accuracy which is typically just before the barrel reaches it's highest point about 2 milliseconds after the round fires. Different bullets/loads make the bullet take different times to reach the muzzle. But for a given barrel configuration, it whips at the same very low frequency for each shot regardless of the load used.