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[quote=tlturbo;424830]On large projectiles like the 16" battleship projectile and smaller ones, rather then engraving the entire surface of the bullet, there is a band at the top portion and another at the bottom of the projectile. On a large projectile, the bottom one is probably copper and is commonly called the driving band (see pic of 16" in my avatar. It's hard to see but just below the taper the shell is a little wider for about 6-8 inches.) The center portion of the projectile doesn't touch the barrel. [quote]
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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