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You may have to swage or chamfer the primer pocket if they were crimped primers.
If it looks like the brass was pressed around the original primer, you can use a couple of turns of a chamfer tool to remove the crimp before seating the new primer.
Yep, you have crimped primers. All the suggestions on how to remove the crimp are already stated above. I had a 550 at one time and had a primers go off while seating them a couple times. When I called Dillon about it they told me not to use Federal primers. I stopped using the 550 to prime and never had a problem after that.