Neck bushing dies were really designed for riffles with tight neck chambers. In these chambers the necks may only expand .002 - .004 after firing. In a factory chamber, the neck may expand .010 - .012 or more. the bushing were never meant to resize the necks more than about .004 - .006. Therefore, they induce a lot of neck run-out when you size more than that. Guys that choose to use them with factory chambered riffles have to size them using 2-3 neck bushings that decreasing in size so they are only moving the neck .004 with each step. Bushing dies are great for the right application
Most standard dies size the neck by squeezing it down several thousands too far and then pulling a expander ball back through it to set the final neck size and tension. This induces lots of neck run-out and over works the case necks (reducing case life). If you are spending $90 for 100 cases, case life is important to you. The most economical way to size a case neck fired from a factory chambered riffle without inducing neck run-out or overworking the case is with a LEE collet neck sizing die. It uses a collet to size just the neck onto an internal mandrel (which sets the neck tension) and never touches the rest of the case. You can set more neck tension by reducing the size of the mandrel. Then, you simply run the case through a F/L body die to bump the shoulder back .001 - .002 and full length size the rest of the case. Many long range competitive shooters use this method because run-out effects accuracy. If you are hunting in 100 - 200 yard range it wont make any difference. If you are shooting long range, it does.
There are multiple other ways to size cases and necks using different sized expander mandrels, different sized expander balls, foster dies with honed necks, etc.. to set neck tension but that might take several paragraph. However, feel free to PM me if you want some further explanation.