I guess I just don't see the point in using a $100+ bushing die if you are not going to use it properly and neck turn...that is one of the steps in the instructions is it not?
The reason neck turning is required is there isn't a manufacturer out there that can produce a lot of brass with consistent neck thickness. A bushing die just squeezes the necks down, so if one side of the neck is 17 thou, and the other 13 thou, you have an off center neck. If one neck is consistent at 17 thou, and the next is 13 thou you can have nice centered cases but varied tension is introduced.
If you don't neck turn, then you have a better chance of getting concentric, consistent ammo with a standard neck sizing die since they use an expander ball for the final sizing so neck thickness can vary some and it makes little difference. Yes you can get bushing dies with expanders, but there is no benefit as they operate the same as a standard neck sizing die so you are just paying twice the price for nothing....
2 cents.