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
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.
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
Bourrelet
…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 projectile precisely aligned with the gun barrel. The bourrelet has a diameter…
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.