Except that it is not? The line in the middle of the bullet is where the case would start. The case would be bigger than the bullet and have a groove at the end to insert and eject the case in the gun/ magazine.
https://en.m.wikipedia.org/wiki/5.56%C3%9745mm_NATO#/media/File%3AGP90.jpg
The small circle on the back looks like a primer so I get the confusion
And media often makes the confusion of showing the whole cartridge being projected.
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Except that it is not? The line in the middle of the bullet is where the case would start. The case would be bigger than the bullet and have a groove at the end to insert and eject the case in the gun/ magazine.
https://en.m.wikipedia.org/wiki/5.56%C3%9745mm_NATO#/media/File%3AGP90.jpg
The small circle on the back looks like a primer so I get the confusion
And media often makes the confusion of showing the whole cartridge being projected.