Old school US ARMY M14 Operation/cycle of function video

Can someone explain the wedges along the actual cartidge?

pull out your fm23-8 and look on page 40 and all will be revealed- if you can't be bothered, it's cartridge 7.62 nato dummy m63- and they're not wedges but indentations- the camera makes them look like wedges- the theory behind that is so you can tell the dummy from the "real thing" by FEEL
 
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