A properly sized neck with good tension won't let the bullet move with just a primer even if there isn't a crimp. I've seen the same with magnum primers as what's in those photos many times.Surprised the primer didn't push them out far enough to lock things up.
Did the primer have an anvil in it?Well I thought that happened to me last week pulled my bullet and full load of powder primer failed to go boom, first time that ever happened to me.
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