Driving band
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A driving band or rotating band is a band of soft metal near the base of an artillery shell, often made of gilding metal, copper, or lead. When the shell is fired, the pressure of the propellant swage
Russian 122 mm shrapnel shell, which has been fired, showing rifling marks on the copper driving band around its base and the steel bourrelet nearer the front
Modern 155 mm artillery ammunition – these shells are unusual in having two driving bands. The shell on the right is a modified M107.
Bourrelet
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A bourrelet is a portion of an elongated artillery projectile that is used in conjunction with the projectile's driving band, or rotating band, to stabilize its launch by keeping the fore part of the
Driving band
…Engage with the rifling of the barrel to spin the projectile and stabilize its flight. The shell is stabilized for yaw in the barrel by a smaller bourrelet band near the front of the projectile. This band keeps the projectile travelling straight in the bore supported by the lands between the rifling grooves…
The unpainted bourrelet is between the yellow and black paint while the copper rotating band is near the bottom of the projectile.
The bourrelet is the forward part of the sabot, supporting the front of the projectile.