Funny that I would run into this thread today. Just a few days ago I loaded a bunch of FC marked brass that had the primer crimp. Also had some type of primer sealant that was red.
These cases gave me fits for a number of reasons. First of all, the crimp was almost never centered, ala Lake City brass. Second, I believe that on many of them the flash hole was not centered.
I used my Dillon crimp remover tool, but still had trouble seating the new primers about 25 percent of the time. The primer would catch on one of the uneven edges of the old crimp. I was able to seat the primer properly on all but 5-6 cases out of 500, however.
The loaded rounds made from these cases work just fine.
I may have to tinker with my crimp remover to make it work better with the FC marked cases that are crimped. However, I like to leave it at a setting that works for the Lake City brass. That setting seems to work for most of the imported crimped brass, also.