TrxR
I use American military Lake City brass and uniform all the primer pockets. And make sure the primers are below flush in my AR15 rifles.
If you can't get your primers below flush it could be your priming tool. The primer should be seated with a "slight" primer crush with a preload on the anvil.
Below a exaggerated example of seating the primer with a slight primer crush. With a priming tool with good feel you will feel the primer bottom out and seat.
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Ive got a K&M hand priming tool. Ive got to swage this brass first. Still debating on the swaging tool. Thinking about a mighty armory. The brass is IVI military.