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Major runout problem.

 
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  #8  
Old 05-02-2010, 08:24 PM
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Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
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Re: Major runout problem.

p.s. Try seating the bullets by small increments while rotating the case maybe 6-8 times. This will compensate somewhat for any alignment problems with your dies.

Maybe, it's popular but it's never done a thing for me. Seems that once a bullet starts in cock-eyed it will continue that way. Most seating stems seem to be to loosely fitted to force any significant off-axis correction.

What I've found that does help, some, is to raise the seating stem so high that the bullet is completely contained in the seating chamber before entry starts and then screwing the stem down in small steps until fully seated.
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  #9  
Old 05-03-2010, 05:35 PM
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Re: Major runout problem.

You could put that fancy sizing die on ebay and pick up yourself a lee collet die....and most likely watch your problem disappear.
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  #10  
Old 05-04-2010, 03:45 AM
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Re: Major runout problem.

After a bit more shooting and a bit more investigation I have found that the problem is with the neck sizing operation. The runout on the neck of fired cases is very good, mostly less than .001. Once the case is run into the neck die ive got between .003 and.006. This is without the expander button.

Am I right in thinking that neck turning wont help this?

Could it be my press thatís out of alignment? Any other ideas?

Thanks
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  #11  
Old 05-04-2010, 04:34 AM
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Re: Major runout problem.

Good move eliminating the expander ball. That is often the cause of erratic necks. Are you measuring run out off the bullet or the neck? If the neck, that is too much. Run out measured at the bullet ogive will usually be a little more. Suggest you look at the K&M or Sinclair neck turning sets, together with an expander. You simply need to skim the necks, not cutting deep into the brass. If you can keep run out at the neck near .003 consistently, that will work well.
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  #12  
Old 05-04-2010, 10:26 AM
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Re: Major runout problem.

How far down are you sizing them, I've seen where sizing down to far in one step can cause some serious run out. Look at your shell holder to make sure that is clean also.
Are you tightening the bushing down in the die, if so back it of just a bit so the bushing will have some wiggle room to center up.
That is a lot of run out on a neck, I would be bumming if I was getting that out at the ogive of the bullet.
If it's due to neck thickness variance you should be able to measure it to see how much extra thickness you have in your neck.
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  #13  
Old 05-04-2010, 11:08 AM
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Re: Major runout problem.

Howdy .... Just my thoughts , I would shoot those 10 rounds , because they are New Brass ... fire form them .. then see what happens when you reload .
Ray
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  #14  
Old 05-04-2010, 12:50 PM
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Re: Major runout problem.

When ever I read about runout problems I see actually two separate issues.

A. Bullet run out - Measured on the bullet at the ogaive.

B. neck runout- Measured on the Neck of the brass casing

I feel the less bullet runout the better cause this is how straight the bullet starts out. How ever the neck run is important cause that starts the bullet in the straight direction hopefully if straight.

I would measure the bullet and see how concentric(round) it is. That will tell you what to adjust or replace next.

If you feel the brass neck is not concentric( round) then I would skim trim to even up abit about 3/4 around the brass neck then circular polish with 0000 steel wool then remeasure that for concentricity(round ness)

Hope that helps
odavid
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