I remember about 1999--- I bought some cor-bon HP in 223. Wanted a good home defense round that would open up a lot and not over penetrate....
I discovered that the rounds would often set back in the case from chambering. several times they went back so far I think the base of the bullet was hitting the powder- else it would have gone all the way in. The case mouth was 1/2 way up the ogive. I just threw the whole lot out because they were just too dangerous. Must have had very little crimp. I like cannelures for that reason. If I'm doing smooth ones I give them a good squeeze with the factor crimp die. especially if its an autoloader. Had some expensive factory pistol rounds do that too.