I have a Forster outside neck turner and use it when ever I need to reduce the neck thickness. I use a cordless drill with a key less chuck to hold the case and then run in the turner pilot into the case mouth. I have a 3/8" drill for the 222 class of cases and a 1/2" for the 30-06 class of cases. I have not done any rimmed cases yet. I will be in the near future however as I plan on making some 30-30 AI out of Win 375 brass. I will have to figure out some thing for those as i do not like the case holder that comes with the neck turner very well. Thinking maybe of making a holder that centers on the primer pocket and screws down on the case head; similar to the head of a Lyman Acculine case trimmer. It helps to have a lathe and mill, you can make things you need/want.
I have recently been working on a 22 BR with tight necks from 6 BR cases. I first outside turned the necks. Then I fire formed to my chamber, then inside reamed the necks before forming with a .224" reamer. Time will tell if it is worth all the bother, but preliminary results are very encouraging.
Overall I prefer outside neck turning, in the case of the 22 BR I got a ring on the inside of the neck right at the shoulder/neck union. The only way to rid it, is to ream the neck. I used a vertical mill to do the reaming, so it went pretty quick. I set up a case holder and centered in under the reamer, then held the case with rubber gloves in the case holder while I lowered the reamer into the neck. I like to use power, whenever I can. More POWER (Tim Allen is my hero
).
Good Luck and Good Shooting