Thanks, I should have said they're slightly recessed. I primed them by hand.
Doesn't hurt to check though so I just went and tried again, they're as seated as they're going to get I reckon.
My experience is that if it's a primer seating issue it fires on the second strike, and none of these did after 2 or 3 times of trying.
I sized all the cases I have, I forgot, all of them were lubed.
Meh, that's alright I guess. I needed a tumbler anyway, cases were getting shabby on the 9mm. Maybe I could wash them or something but I'm not convinced that'll do what I want, or that I want to go through the hassle of drying them LOL