I full lenght sized them and neck sized them and did not notice this the first time . All trimmed to 2.005
Shot them and they shot just over .58 at 100 yards
So I go to load more tumble them then just go to neck size them .
Loaded round measures .331 using a redding bushing .327
Am I just neck sizing to much to cause this bulge ? Right above the shoulder
I believe I have the neck die set up correctly , I neck size for my 300 ultra and my 7mm-08 with redding dies also with no problems ?
Is it me or do I have a die problem or is.004 to much to neck size this brass ?
Help here is a pic of the brass .
I am going to shoot ! No I mean I going to shoot way over there !
What type of neck die (competition, type S, etc)? Does it have an expander?
What is the neck diameter at the top vs at the bulge?
Do you know when the bulge is forming (could it be during bullet seating)?
I have never seen anything like that with any of my Redding neck dies, and I have some FL dies that oversize the neck over 4 thou (before expander) that are also OK. I'm interested to see what responses you get for when I undoubtedly have this issue some day . . .
Looks to me like the case neck in the picture isn't sized down to the same diameter all the way to the shoulder. I'd adjust the full length sizing die so the fired case shoulder's set back about .002". That'll well center the sized case neck on the shoulder for best accuracy as well as allow easy bolt closing and repeatable positioning for each shot.
I don't think you need to neck size your cases; just full length size them.
And if your loaded round's neck diameter is .331", I wouldn't use a bushing in your full length sizing die smaller than .329"; .328" at most.
Looks to me like you could size down farther on your neck, also just a recommendation, but I would try bushing that size down the neck less. I used to size my neck 0.004" under the loaded dimension too, when I tried bushings that sized less my accuracy increased. Now I'm at 0.001" under loaded round dia on the neck.
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.
I have a 300WSM with the opposite of a tight neck (loose neck?). It is a weirdly accurate factory rifle, and I use Type-S bushing dies to size. Because the fired neck diameter is so large, I have found for run-out reasons that I have to neck size in two stages (increments of about 3 thou each).
It is possible you have a similar situation, and you are not sizing all of the way down the neck (as others have pointed out). Is your fired neck diameter significantly larger than the loaded neck diameter, or does it get wider as you get closer to the shoulder? Very intetested to hear if/when you identify the cause.