RCBS makes a swagging die that is really easy to use and it presses the crimp ring out of the way..you may still have a slight problem getting some primers to seat, but it sure makes it easier to deal with a lot of that brass...
Back when things were really heating up in the Middle East, Federal started crimping all of their .223 brass on a cost cutting basis and I have some civilian commercial rounds (about 1,000) that have it as well as the military ones..
I think there is also a crimp cutting tool that will actually cut the crimp out that works on the RCBS prep station, but I haven't bought it for mine...probably should..
If you only have a few cases like that, your deburring tool will cut them out by hand...