Hi guys I have been loading .308 for a while. I use the Redding Competition Bullet Seating Die and the Redding FL S-Type Sizing Die (with changeable bushings) to size the neck and push the shoulder back .002. However, I am on a mission to reduce my case run-out. Fired cases need the necks sized down about .011 to get proper neck tension, Redding says that sizing that much all in one step will cause the run-out. They say to do it in at least 2 steps using a neck bushing that sizes the first .006 and then a second that sizes the remaining .005. I still get more neck run-out than I would like. I do not turn the necks so I know I will get some run-out as a result of varying case thickness. However, I should have the same run out on a sized case as I do on a fired case unless the die is introducing more runout. I have tried o-rings under the die body which cuts the runout in half. I have read on several benchrest and long range precision shooting forums that many are using the LEE Collet Neck Sizing dies to initially size their necks down before running them through a S-Type Bushing die to get their final neck tension. So.... I purchased a Lee Collet Neck Sizing Die in .308. It will size the necks to within .001-.002 of what I need which is exactly what I want. I'll run them through a FL sizing die to finalize the neck tension and bump the shoulders back. PROBLEM.... The collet die is also bumping the shoulder about .004. I have adjusted it (as per several suggestions) so that it touches the shell holder and then is turned in 2 full turns so there is not cam-over on my T-7. The directions say that it will take 25 lbs of pressure to form the neck. However, I have put much less than that, just lightly sizing the neck a few thousands and it begins pushing the shoulder back. Many swear by these dies to reduce run out but no one mentions that it also bumps the shoulders in the process. Lee technical support says that it should not be bumping the shoulders either but could not find any issues with me die setup. For those of you that are familiar with these dies, any ideas as to what I am doing wrong?