mike06
What I've read if your neck turning , the outside diameter is true to the inside diameter of the case neck so you can eliminate the expander ball , I'm not neck turning so To square up he diameters your best to size with the ball , l lube the inside of the necks with a Q tip the ball goes through with very little resistance , I also don't lock down the stem and it self centers as it goes through the necks , runout is .001 using the standard RCBS Full Length die nothing fancy . I tried the S type bushing die to try .001 and .002 neck tension , didn't change anything on the target but the runout was horrible sizing the same way with the expander carbide ball . Standard is giving a .003 tension and using the dry lube in the necks the bullets seat very smooth. I also am shooting a 308 Rem 700 blueprinted Rock Creek M24 5R barrel , Jewell trigger set at 10 ounces . Just love shooting it , not even interested in shooting any other rifle . It's my one an only for the last 12 years . I'm enjoying shooting more that I'm not trying to drive myself nuts in tweaking every little thing . Fine a round that works , stick with it an work on form , groups are more consistent and get back to the joy of shooting .