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case neck and bullet runout

 
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  #1  
Old 11-28-2013, 11:02 AM
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case neck and bullet runout

Since I recently found out that I had .005 to .008 bullet runout on some 300 win mag rounds I loaded in Sep, I have become interested in bullet runout. I'm loading for hunting, but I want THE most accurate round I can load. A 1/4" inch improvement at 100 yard groupings is important to me. Just the way I am.

I've squared the RCBS dies, got a Lee decapping die, moved the expander ball all the way up in the FL sizing die, put the bullet straight up in the case before seating it and rotated the bullet 180 degrees after seating the bullet half way. I tried some 270 win fireformed brass and loaded dummy rounds. I got less than .001 bullet runout, but the runout measured on the neck about 1/8" from the mouth was .002 to .003.

How could I get so little bullet runout but have a significant case neck runout??? Which is more important measure for accuracy: bullet runout or case neck runout or both? If case neck runout is important, what can I do to correct it?

Thanks.
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  #2  
Old 11-28-2013, 11:49 AM
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Re: case neck and bullet runout

You might pick one set of conditions for anyone to reply on.
Is your question for 300WM, or 270Win?
What are the conditions for either of interest?
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Old 11-28-2013, 11:50 AM
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Re: case neck and bullet runout

Might not be what your really looking for, but read what Mikecr has to say. I just ordered the mandrel's to see if it helps. I'm really hoping it does.

Redding type S neck sizing die question
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Old 11-28-2013, 12:04 PM
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Re: case neck and bullet runout

Quote:
Originally Posted by Mikecr View Post
You might pick one set of conditions for anyone to reply on.
Is your question for 300WM, or 270Win?
What are the conditions for either of interest?
My question is about the 270 win loads. As I stated in my original post, I'm interested in knowing 1) why there can be more runout in the case neck than in the bullet; 2) which is the more important measurement, case neck or bullet runout for accuracy; and 3) if case neck runout is important, what can be done to correct it.
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  #5  
Old 11-28-2013, 12:39 PM
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Re: case neck and bullet runout

You can turn the necks, both inside and out. I think the runout of the finished loaded round is a function of case neck runout for the most part. Both contribute so correct both the best you can. Even with a properly prepped case, including inside and outside neck turning, you can still seat a bullet with a bit of runout. One measure I took was to eliminate the expander all together and opened up the die neck to .003 less than a loaded dummy round.
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  #6  
Old 11-28-2013, 12:47 PM
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Re: case neck and bullet runout

I also anneal after each firing for the most part. I've had no problem with consistent, repeatable accuracy.
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  #7  
Old 11-28-2013, 07:12 PM
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Re: case neck and bullet runout

If you had thick and thin side on the brass of your neck that measured .015" and .013" respectively, you could have zero runout on the bullet and .002" runout on the case neck brass

But runout on the case neck is of little consequence compared to bullet runout

You could outside neck turn and solve the case runout but haven't accomplished much IMO
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