Hello,

Did you say that you measured new Lapua cases and the pocket depth is 0.120" max ?

Judging by my measurements, the CCi primers at my measurement of 0.120 will only just fit perfect! That is as long as you get a "full insert" into the primer pocket.

Of course if you get a batch of primers that are in excess of 0.120" , then you will have your problem of not seating flush.

Again I have never had this problem but!

Perhaps even on new brass, it might be a good idea to try a different pocket cleaner on a few cases to entirely clean the surfaces and try some primers in the cases again.