Originally Posted by orangello
I noticed when comparing to the last mag of the heavies that the line around the case (some kind of decorative crimp?) was lower on the heavies.
The cannelure in the case is to prevent the bullet from setting back into the case.
Heavier bullets are longer, and therefore seated deeper, so the csnnelure needs to be farther back from the case neck,
With modern methods of ammo manufacture, I often wonder if these case cannelures are there more for appearance than function.