I also use a dry lube on the inside of the neck, seems to make a real difference and the kit was inexpensive. Have had a couple of .223 cases split in half but is was always caused by the neck resizing ball on the upstroke of the press and the cases were only reloaded a couple of times.

I probably use too much case lube however have not had any problems so far. If you are getting hydraulic denting and only lubing the sides somehow there must be a migration to the neck which I have never experienced.

I enjoy reloading everything except .223.