22lr vapor trails

This rare phenomenon started happening just as we finished up a range session. I quickly grabbed video as the shots swept downrange, and I’ve compiled them here. As best I understand this phenomenon, the angle of the light and the perfect humidity gave us this momentary opportunity to actually see the trail of the bullets heading towards the target.
This is a CZ 457 LRP, MDT ACC Premier chassis, Spearhead tuner/brake, Timney trigger, Bushnell XRS 2 Elite Tactical, Area 419 rings and 30moa rail, shooting RWS R100 22lr.