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Carbon on the outside of the case neck after firing?

 
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  #1  
Old 09-18-2013, 10:12 PM
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Join Date: Feb 2013
Posts: 27
Carbon on the outside of the case neck after firing?

In the different loads I've tested, the most accurate at 100 yards leaves carbon around the necks of fired cases(ie almost black). A slightly hotter load I found more accurate at 600 yards leaves much less carbon on the case necks(some slight carbon deposits).
Additional info:
6.5x47
130gr Bergers
H4350
39.0gr yields 1/4-1/3moa at 100, and 2" vertical by 5" horizontal 10 shot groups in light variable winds.
39.7gr yields 1/2-3/4moa at 100, and 1" vertical by 3.5" horizontal 10 shot groups in the same winds.
The carbon around the necks never goes past the necks. I had read somewhere that carbon around the necks is a sign of low pressures? The 39.7gr of H4350 is a max load in Berger's manual...I had tried a load at 40.0gr with no pressure signs when I was developing a load at 100 yards, but did not check how much carbon was around the necks...is this something I should be worried about?
Thanks,
Ken
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  #2  
Old 09-18-2013, 10:56 PM
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Join Date: May 2009
Location: Australia
Posts: 733
Re: Carbon on the outside of the case neck after firing?

It's not a big concern if it's only minor carbon .
Low pressure is not always the reason.
Uneven or rough neck walls can do it .
I think uneven neck hardness may contribute also.
Make sure the inside of the chamber neck area is clean and no carbon ring present .
A light skim 70% neck turn and an anneal may help .
I skim neck turn every cartridge I load for and never ever get carbon on the necks .
The powder could be a bit slow for the application . Try Varget .
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  #3  
Old 09-19-2013, 08:14 AM
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Join Date: Jan 2013
Location: Meridian, Idaho
Posts: 1,198
Re: Carbon on the outside of the case neck after firing?

I always get carboned necks. I shoot lapau brass, neck sized, fire formed, and nothing changes it. I have loads that produced sticky bolt lift, flat primers, and extractor marked, still carboned up. So the pressure was definitely there.

I hate it, but the rifle shoots well so I don't bother to change anything. I thought it might be dirty burning powder but 4350 is not typically described as dirty and you have the issue, so who knows.
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  #4  
Old 09-19-2013, 01:17 PM
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Join Date: Dec 2011
Location: Michigan
Posts: 1,056
Re: Carbon on the outside of the case neck after firing?

I have two rifles that consistently leave some amount of carbon on the necks (different bullets, powder, etc and its still there). Unless it is excessive, I don't sweat it.
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  #5  
Old 09-19-2013, 05:32 PM
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Location: NC, oceanfront
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Re: Carbon on the outside of the case neck after firing?

Sounds like excess trimming from chamber end.
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  #6  
Old 09-19-2013, 08:05 PM
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Join Date: Dec 2011
Location: Michigan
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Re: Carbon on the outside of the case neck after firing?

Quote:
Originally Posted by Mikecr View Post
Sounds like excess trimming from chamber end.
Never considered that. I'll bet it is. Trim-to-length is likely waaaay shorter than necessary in my rifles that leave carbon.
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  #7  
Old 09-19-2013, 08:44 PM
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Join Date: Feb 2013
Posts: 27
Re: Carbon on the outside of the case neck after firing?

So I'm trimming to the recommended 1.840", I know the chamber will be 1.850", should I not be trimming this short?
Thanks,
Ken
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