I am loading for a .338 Lapua Improved with a 40deg shoulder. The rifle is new to me and so are the dies (Redding S variety,) here is the situation... I am working with about 60 brass that is 2-3 X's fired. When I got the brass, I tumbled it in S.S. media and water, annealed it all, (by hand with 750deg F. Tempilaq, trimmed it all to the same length, chamfered&deburred and then.... NECK SIZED ONLY, WITHOUT the expander ball... So at this point everything was great, brass all nice and shiny, all the same length, neck sized only, with good neck tension... Yesterday, I noticed that about half of the rounds chambered easily and some of them were a little tight. So, I figured AH-HA! this is the perfect opportunity for me to use my new body die for the first time and bump the shoulders back. So I got the body die all set up and I am bumping them back to the point that I can still just barley feel them chambering.. (They are not as tight as they were, but it is still a LITTLE harder to close then if the chamber was totally empty.) So I am thinking this should be about perfect... Now the problem... After coming out of the body die there is a slight bulge at the bottom of the neck. It basically runs from where the neck resizing bushing stops and where the shoulder starts. The brass is THICKER on the INSIDE AND the OUTSIDE now in the affected area. I know it is thicker on the inside, because I ran my case neck trimmer mandrel inside the neck and it stops at the bulge and would not go in any further. At this point I have only ran 5 brass through the body die. On every one, the case neck trimmer mandrel (.334" Dia.) would not go all the way down inside the neck, it keeps getting stopped at the interior bulge area. I know there is a bulge on the outside, because I can see it with the naked eye... I threw the FL die in the press and ran just the expander ball through the necks on those 5 brass just now so I wouldn't have any unwanted tight spots... Now, I have uniform interior neck diameter, and brass that is fitting in the chamber perfectly. There is a little exterior bulge is all... So, am I doing something wrong or out of order? Or, is this normal for these type of dies... Should I just keep going and start using the expander ball on all the brass I have to bump the shoulders back on? What can I do about the bulge left on the exterior of the case? Just trim it off? Sorry about the long read and thanks in advance for any thoughts/suggestions.