I use redding competition neck bushing dies, these do not bump the shoulder back like the full length shoulder dies. I do not use the Hornady tool, I believe that they are not precise unless you are using a modified case that was actually fired in your chamber. You can make your own from your fired cases. I partly neck size a case, fired from the chamber of the rifle, I am reloading for, seat a bullet long , put it in the chamber and slowly close the bolt, carefully open the bolt and take a measurement. What you will find is the bullet will be pushed into the case, this could be the seating depth of where you are just touching the lands, but many times the bullet will actually be pulled slightly out of the case, from sticking in the throat. I will do this several times, . When I think that the bullet is giving a true depth setting reading I seat a bullet a few thousands under and try it in the chamber, then seat it again a thousand or two out till there is no change in the seating depth of the bullet, in or out. Like I said many time your bullet is actually pulled out of the case a little. You can mark the case with smoke or a marker, but I have never been able to see well enough to be right on. With your Hornady tool and an actual case from your chamber, threaded to fit you tool, this would probably be the easy way. If you are using a full length sizing die sometimes a spacer between the die and shell holder will prevent you from bumping back your shoulder. This is when working with bolt guns. Hard to explain it in words. Problem is many factory chambers have a larger neck diameter than you want, it may be hard to get a bushing that sizes enough, to give good bullet tension, with out over sizing and allowing to much neck expansion. Only partly sizing the neck can help with this problem. The part of the neck closestto the shoulder would then be unsized, and the part closet to the mouth can be sized enough to still hold the bullet well. Again it is hard to say it all in words. Read on some of the reloading forums and you will find some people who are able to explain it well.