A good gun with a good load (one that is stout enough tomake the gun work) will do it. Won't day in and day out, but it will.
What I'm suggesting:
Get a case and run the bushing over the neck. Load that cartridge and fire it. Now push that bushing over the neck again (this makes the case hold the bullet, that's all), load powder and a bullet again and fire it again (you may have to drop the bolt from lock-back). Do that three times. After that you know that the brass is as expanded as it can be. Take your measurements off of that.
Neck sizing only will most likely lead to malfunctions in a semi-auto, but this is a one-at-a-time procedure so reliability isn't an issue.
Mine still function fine, though.