Looking at the pictures. It appears that the cutting of the necks is short of the shoulder. Not for sure, but that what it appears to me. The neck cuts should stop at the transition from the neck to the shoulder angle. (don't cut into transition either, and not short of the transition either) That's why I first trim my cases all to the same length. Setting the stop, all the necks are cut for thickness is consistent. My reloading manual are all put up except for and old Nosler Manual printed in March 1976. So nothing on CM loading. I have never loaded for CM. How many time has that brass been fire presently? The annealing line appears to be very good were it stop at if that was you annealing the brass. If the brass has been fired before cutting the necks for thickness? Then you will need to size, and use a mandrel to push any uneven portions of the neck to the outside to cut the necks to thickness. Other the uneven spots can be on the inside of the neck. So no gain there. I have read several time here that people are using a mandrel to push uneven portions to the outside of the neck. I guess figuring that's okay. To me you have just moved it to the other of the neck. The neck still hits the chamber uneven kicking the bullet off to start with. I got lots of new equipment, but haven't really been able to put them into use just yet. I had been waiting on my new rifle to be completed to put the loads together doing all the trick things or steps that need to be done for long range.
I started into looking at having a 257/280AI built. The barrels are out 12-14 months. I am 74 presently. I am wondering do I move forwards or not. I would be 76+ at that time. I will have to think about that for a few days. The golden years!