Case neck runout with type S neck die

[284driver]

Just received my Redding type S bushing die set and started sizing my fireformed 22-250 cases. The necks had been cleaned up about 75 percent and the concentricity guage showed less than .001 runout on the neck before sizing. Now i run the case into the bushing die without the expander button and re-check the case on the concentricity guage and i am getting up to .006 neck runout. Same with a carbide expander button installed. Next, I put a sharpie mark on the case rim before sizing and insert the case with the mark pointing straight out of the shell holder, resize and re-measure, the high side of the neck is 90 degrees clockwise from the mark. I then turned the die ninety degrees and did the same thing with another case, the high side this time is 180 degrees from the mark. I don't know for sure but i think the die is bad. I take the cases i sized and run them into a Hornady neck die and am back to .001 or less runout. I tried two different bushings with the same results. Any input would be appreciated for i am gitting irritated fooling with this.

 

[terryb]

If you are using a factory barrel and factory chamber,this problem is adressed on redding web page.If your fired round neck is something like .006 over a resized neck that will hold a seated bullet,then it is pretty common to see this.You can take the neck down in two steps and fix this,but it means using two different size bushings,i gave up on bushing dies in a factory chamber because of this,the bushing dies work great in a custom tighter necked chamber.

 

[284driver]

I just read that on reddings website. It seems to me that i am reducing neck diameter less with the bushing than with a factory sizing die. One would think that to be more consistent.

 

[Rob01]

Sky if you are sizing down more than about .005" then you need to do it in a step down process or you will get excessive runout. My .308 goes from .342 to .331 and I have a .339 and .335 bushing I use to size it down before using the .331. I use them on a Dillon 550 with multiple dies so it's not a problem but it can be more work if you are using a single stage.

 

[Gaillo]

Hi there!

I had similar runout problems when I tried S dies,without expander). I solved the problem by obtaining Lee collet dies and Redding body dies,so I could still FL size). My average concentricity is now around 0.001" - about 4X better on average than I was getting with the S dies.

 

[elkhunter7x6]

Hi there!

I had similar runout problems when I tried S dies,without expander). I solved the problem by obtaining Lee collet dies and Redding body dies,so I could still FL size). My average concentricity is now around 0.001' - about 4X better on average than I was getting with the S dies.

I traveled the same road as you. Now I need to sell some Redding bushing dies. You dont always get what you pay for.