The dents are something like these:
The rim of the neck is "bumped" and it's 0.003" thicker than the actual neck.
I was using the .335 bushing, because .308 + 0.015*2 - 0.003 = 0.335. It's my first time to resize a brass so I don't know what kind of force I should apply. With around 25 lbs...