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"Cannelure"; that's it! "Cannelure." You're new nickname is WildRoget. (Roget's Thesaurus...get it? )

And something that used to be more common than it is today is newly-manufactured ammo in brass casings that have an extra crimp below the body of the bullet, precisely to help constrain the bullet from moving farther into the case to prevent setback. Here's an example of a Corbon:



It costs a bit more to manufacture with this little detail, and unfortunately it's becoming harder to find, even in high-quality defensive ammo. You'll notice the imprinted ring around the bullet itself, clearly indicating the correct setback. You can still find that more often than you can the second casing crimp, and it least it provides immediate visual information if the bullet has been pushed into the case.