I use WCC brass all the time without prepping the primer pocket on my Dillon 550C. Have not had a reject yet. Yes, I can feel the primer going in a bit stiff but it sits and shoots fine so far. I see approx 5/100 rounds that I reload. I guess it is shot by persons at my club where I pickup brass.
The ONLY brass I stay AWAY from is IMI. Had problems with this brass not resizing properly for some reason so I gave up on it.