Take a look at this post at another site, you might find it helpful:
Bullet Marks
FWIW - the ring is not normal and can be fixed by several approaches including replacement, polishing with extra fine sandpaper or steel wool, etc., as mentioned in the above post. Much will depend on the specific reason for the ring. If it's due to a defect in the seater stem, replacement or repair are your best options. If it's due to excessive neck tension, you can fix that easily by backing off the neck tension to a couple thousandths.
FWIW - Redding makes seating stems for both tangent and secant ogive (VLD) bullets. They're about $20.00 each. It is not the entire seating micrometer, just the stem that goes inside. Unless you're using VLD bullets, there shouldn't be any need for a VLD seating stem. Using a VLD seating stem may actually solve the ring problem if you're seating non-VLD bullets, but be aware that's probably not why you have the problem in the first place.
If it's a defect in the stem, replacing it with a new [regular] stem will fix the problem just as well. People generally match the seater stem to the type bullets they're seating in order to minimize runout, not to fix impression rings in the bullet jacket.
I had an issue recently with a .223 seater that was also giving me rings. In my case, the stem had a defect, so I called Redding about it. They were very helpful and are going to replace the defective stem. They also gave me the specific catalog numbers for the different .223 stems they manufacture, which weren't so easy to find at the suppliers. I mainly wanted to pick up the .223 VLD stems for seating 90 gr VLDs. You might try giving them a call and see if they can help you as well. Good luck.