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Originally Posted by RustyBattleship
A bourlette is a notched "groove" impressed into the projectile. The main purpose is to provide a groove for the "lip" of crimped cartridge cases to seat into.
This provides sealing against water and prevention of the bullet falling out (from recoil of previous shots rather than dropping on the ground).
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That all copper band near the base of the projectile is properly known by two different names. One is the cannalure band and the other is the rotating band. Cannalure is the accepted technical name though Rotating is what it is actually used for as well as a gas-check.
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Rusty, I think you may be using small arms terminology which differs from artillery terms. The cut off point of small arms being 40mm. Anything over is artillery, be it land or naval.
TlTurbos definitions are close to official DoD with a few additions.
[Blockhouse mode on]
The bourrelet is an accurately machined surface that is slightly larger than the body and located immediately to the rear of the ogive.
The purpose of the bourrelet is to center the forward part of the projectile in the tube. It bears on the lands of the tube to provide forward support of the round during firing.
The rotating band does not engage the rifling of the tube but instead engages the start of the rifling in the forcing cone of the tube.[Blockhouse mode off]
I have never seen or heard of a bourrelet behind the rotating band. Some rounds have bands rearward of the rotating band but those are Obturating bands