The only crimped cases I've been able to seat primers in are a batch of 9mm cases . I bought 1k WCC-11 and 1k WCC-12 once fired cases , I don't remember which ones but one batch I had to remove every crimp while the other primed like new virgin cases with out touching the crimp .
These are all crimped, I can see the crimp. Some are not as pronounced as others even though it is all Lake City. I decided to just go ahead and remove the crimp on all of them to stay out of trouble.
That is what I do because there's been times I find some cases in a lot that don't need the crimp removed but some did . Running across those that need it just got to frustrating when wanting to move quickly through the priming process . Running them all through the crimp removal process is just less hassle in the long run for me . Or what Marco said
Are these the LC-16 I sent you . I ask because my LC-16 all have the crimp removed but I still get a primer hanging up a tad from time to time . Likely because just enough of the crimp is left to catch the edge of the primer . The primers still seat but there is definitely a resistance that's not there with the rest .
I should add that I prime all my cases by hand so I have a good feel when priming as apposed to priming on a press where you might not feel that slight hang up right before it seats .