If you push the primer down too hard, you run the risk that you pushed it's key components out of place. A primer is made up of three components, explosive compound, cup, and anvil. If the anvil is out of position, it could cause the primer to malfunction. I would just use the cartridges that you loaded with the primers crushed down as plinkers. Next time, when your pushing the primers in, you should feel a slight resistance once the primer has bottemed, stop there. The cup of the primer should be slightly below the edge of the primer pocket. I have two tools that I consider very important for primer seating consistency. The first is the primer pocket uniformer, which makes all of the primer pockets the exact same depth. The second is the primer seating depth gauge, which is a go, no-go gauge that lets me know if I'm seating too deep or too shallow.
Mike