(ordnance) The cylindrical surface of a projectile on which the projectile bears while in the bore of the weapon.
Bourrelet
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(¦bu̇r·ə¦lā)
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The bourrelet of a projectile is the point (or points) of a projectile which have the largest diameter, other than the driving band.
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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