I did a bit of math, to space the bands so that the lengths of the span between the bands were odd order harmonics to each other (section from the breech to the first band, section from the first band to the second band, section from the last band to end of barrel). This discourages standing wave vibrations travelling down the barrel and disturbing the position of the end of the barrel when it is fired. I would love to place a force balance accelerometer on the middle of each span to confirm my calculations, it would be interesting to know if the assumptions in the math are true.
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