Neck turning is performed to fit the case neck to a custom chamber. You can check for variance in case neck thickness if you wish using a ball mic.
Why would a seater die have a neck bushing?I have a forster comp seater die. There is no bushing for it..
I don't use Forster, but if NECK thickness effects it's operation, I suggest you promptly drop it in a trash can & get a better seating die.am I just making it all worse because the die wont seat properly because of the missing brass
Seater dies do not grip bullets.How do I tell how much grip my dies would be putting on the bullet if I uniform the neck
Desired tension is produced by adjusting neck sizing among other things, and bushing dies are adjustable for this. FL dies which size necks are not adjustable, and so may need to be customized to properly account for your brass.What aspects of neck tension are the sizing dies with bushings controlling that the other dies are not if the neck are the same?