I know the CCI #41 5.56/NATO primers are pretty hard (of course, they're supposed to be - that's part of what makes them different from CCI #400 small rifle primers.)
When I was setting up my Dillon Super Swager and trying to figure out what depth to swage to, I discovered that I could re-prime crimped brass using the CCI #41 primers *without removing the crimp at all*. Of course, I don't recommend it as a regular practice, but it allowed me to be a little bit less aggressive with the swaging, knowing that the primers would still seat no matter what.
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