Help urgently needed with case neck run out.

[ericbc7]

How do you measure your case neck run out? Meaning what component of the runnout is due to the portion of the case called the "neck"?. is your body and shoulder runnout good? and what tool do you use to measure these points?

 

[dkhunt14]

Is the runout on the case after sizing or on the bullet after seating? Matt

 

[LawrenceHanson]

It would be helpful to know a bit more about your situation in order to reduce confusion and to provide more meaningful responses.

Are you reloading for a gun with a SAAMI specification chamber?

Are you neck turning your cases?

Are you able to measure the neck wall thickness of your cases?

It’s important to understand how these factors can influence the concentricity of your sized cases. Inconsistencies and tolerances can stack up resulting in sized case necks that are out of alignment with the case bodies, especially when using a bushing neck die in conjunction with unturned cases in a factory chamber. As you have discovered, some size die designs work better than others depending on your chamber dimensions and case preparation methods.

I took some S&B once fired brass... checked the run out... less than 0.001" neck runout... cleaned 2 cases with polish and sized once with the Redding die and one with my old Lee neck size die.... same happend with Redding die and Lee stays less that 0.001".

To think I was looking for better buying Redding dies and press... cause many say its one of the best etc... and the Lee press and dies works better... Life's lessons and the collage of Hardknocks! My $32 Lee dies kick's Redding $100 die....

But you do have a Lee collet neck size die that produces straight cases that you can get by with, at least until those cases become difficult to chamber and extract. Until then here is some information to get you thinking about what is happening to your cases during the firing/sizing cycle and methods to keep your cases straighter and lasting longer.

http://riflemansjournal.blogspot.com/2010/04/reloading-few-concentricity-questions.html

http://rickaverill.com/projects-past-and-present/lapping-reloading-dies/

 

[BoydAllen]

I am not a fan of neck sizing for multiple reasons, one of which is that with typical (non collet) neck dies there is nothing to hold the case body in alignment with the die as the neck is being sized, with the result that runout is generally not good. This is a matter of design, not who made the die. If you want some straight ammo, and do not want to have issues with bolt closure, and the effect that differences in this within a group will have on group size, try neck sizing with a collet die, followed by using a body die correctly, so that you have the correct amount of shoulder bump relative to the dimension of a tight case. On your existing neck die (Redding) check the fit of the base of the case with the bushing removed, and the case in the die with a shell holder on the rim to act as a stop. If the fit is loose, try lining the inside of the die near its bottom with a layer of tape of suitable thickness so that most or all of the looseness is eliminated. I have done this on threaded seating dies with good effect, both sliding sleeve and one piece, using colored masking tape that is designed to be easy to remove. The trick is to not have it overlap a its ends. I have handled this by letting the ends lap, cutting a line through the lap with an Exacto knife, and then removing the parts that overlap. I cut the width of the tape down to make it easier to insert in the die, which can be a bit tricky.

 

[Tim Singleton]

Do you have a Redding full length type S die?

From my limited experience it will give better results and you can still change bushings as you need

 

[barefooter56]

acssa,
Back the locking screw in the die lock ring out away from the threads and run a once fired case through the die and check the run-out. Also you want to make sure the numbers stamped in the edge of the bushing are facing DOWN tword the cartridge case not up ! The numbers may have an "edge" on them that cocks the bushing as it gets pressed up against its stop. Last but not least go up a size (.001) and see it that solves the problem but still gives you the neck tension you need. Redding bushings can run a little smaller than marked. Dont give up on the die yet!
Take care,
Phil Hoham
Berger Bullet Tech

 

[joejo]

Just use your Lee die. I have never had luck with bushing dies. I take alot of time turning my necks and making sure everything is right and both my redding and Whidden dies cause like 3-7 tir. My collet die with body dies are all I use now. Thing is I have had these bushing dies made off of my reamer prints, not just off the shelf.

With my current combo before sizing I have virtually 0 tir. After sizing the body and neck seperately it still basically zero. Sometimes up to 1.5 thou Max.

 

[acssa]

How do you measure your case neck run out? Meaning what component of the runnout is due to the portion of the case called the "neck"?. is your body and shoulder runnout good? and what tool do you use to measure these points?

Neck was out, checked the shoulder.

 

[joejo]

To expand on my previous post. I think in 7/8x14 is where the problem lies. If you used a bushing neck die with an arbor press I bet they would work great. Like Wilson dies specifically.

 

[acssa]

Purchased a Forster Bushing Neck die with the same size bushing....did one case and worked 100%.... added no run out.
When I am back I think I should make a movie between the 2 dies showing what happens.

Thanks again to all responses.... I will read all suggestions again and try them all.

 

[joejo]

I will say I have always had good luck with Forster dies. Thanks now I may have to try their bushing die. Way to go. I cant wait to spend more money I don't have

 

[Erik Cortina]

Get a F/L bushing die, I find them to work best and it will save you one step.

 

[artbosco]

I have a case neck run out problem.... after I bush neck size the cases I have neck run out of 0.004 and more. I use Redding dies and Norma, Sako and other brass... the same happens to all of them. :-[

Please help!

Full Length Size to reduce headaches associated with the half measure of neck sizing.

 

[Mastershot]

Try annealing the brass first, then use a mandrel neck sizing die.

I have and use redding dies also. But I switch my operation a little bit and started using Lee collet die to just resize the neck tension.

 

[ridgeway]

Have you checked a fired case to see if there is any neck run out?

 

[acssa]

Yes... between 0 an .001"

Have you checked a fired case to see if there is any neck run out?