Bourrelet
Encyclopedia
The bourrelet of a projectile is the point (or points) of a projectile
Projectile
A projectile is any object projected into space by the exertion of a force. Although a thrown baseball is technically a projectile too, the term more commonly refers to a weapon....

 which have the largest diameter, other than the driving band
Driving band
The driving band or rotating band is part of an artillery shell, a band of soft metal near the middle of the shell, typically made of gilding metal, copper or lead...

.

The bourrelet diameter is important as it can effect the in-bore yaw angle and therefore the stability of a projectile during flight
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