So im looking at getting a better set of dies for the 7-08, ones which have bushing dies. When ordering the bushings, are these relative to the outside of the neck and if so, does it allow for any spring back? for example, my case walls are 0.015 thick, the bullet is 0.284. thus the overall loaded outside diameter is 0.314. Ive been told that ideally you want a minimum of 3 thou neck tension and probably max 5 thou. So, if i want say 4 thou, do i just order a 0.310 neck bushing? Or am i likely to find that this actually squeezes the case to 0.310 outside diameter and when released from the die, springs back to say 0.312? This is obviously important to me as i could end up getting a bushing which in theory is right but in reality leaves me with too little neck tension?