Around the 5:30 mark, John is asked about barrels 'walking' as they begin to heat up. He states that he doesn't believe the heat of the barrel is diminishing accuracy, but rather the mirage is making it harder to aim as consistantly. Seems like a logical point of view, especially from someone so vested in understanding barrels. Just wondering what everyone's thoughts or opinions were on this, or if anyone has ever tested this theory say with a mirage band or other method?