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Reloading Techniques For Reloading


Soot on the case body?

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Old 09-11-2013, 08:21 AM
Junior Member
Join Date: Jun 2013
Location: Mining brass west of Red Deer
Posts: 11
Soot on the case body?

I was out at the range on the weekend printing groups with my Tikka T3 6.5x55 Swede (love this thing) and during my 3rd sting I noticed the case pictured below. It still printed it's usual 0.5MOA 5 shot group.

Virgin Lapua brass (neck sized)
CCI250 Primer
47.5gr RL22
140gr SMK

Sorry about the poor quality (phone camera) I tried to capture the soot in the extraction groove.

I haven't seen this before and it has me concerned... I'm not sure what the issue could be. If someone could point me in the right direction, it'd be greatly appreciated.

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Old 09-11-2013, 10:32 AM
Silver Member
Join Date: Jun 2010
Posts: 180
Re: Soot on the case body?

One of 2 problems I guess:

1) Shoulders sized back too much;
2) Neck tension not enough to enable proper expansion of case body and thereby resulting in gas leak.

Annealing the cases also essential to enable proper seal.
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Old 09-11-2013, 01:58 PM
Gold Member
Join Date: Dec 2009
Posts: 918
Re: Soot on the case body?

It's virgin brass and Lapua brass is factory annealed, so I don't think that is the issue.

Likewise, the case neck is not being smoked, which would seem to indicate that there is sufficient pressure to seal the chamber.

I am not sure where the soot is coming from, but I am not inclined to believe there is an issue to be concerned about.
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Old 09-12-2013, 07:31 AM
Platinum Member
Join Date: Jan 2008
Posts: 1,111
Re: Soot on the case body?

Could be the virgin cases have the shoulder pushed back a little too much for your chamber and thus some gas is getting past the shoulder before it expands enough to seal the chamber. This is just a shot in the dark. I would try cases that have been fired once and neck sized to see if this goes away.
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Old 09-12-2013, 04:16 PM
Silver Member
Join Date: Mar 2012
Location: New germany, NS
Posts: 343
Re: Soot on the case body?

I agree with RT2506, load it up again and see if it sorts its self out
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Old 09-13-2013, 08:38 PM
Platinum Member
Join Date: May 2012
Location: N.D.
Posts: 3,145
Re: Soot on the case body?

Slow powder and moderate powder capacity; I'd bet your peak pressure isn't coming on fast enough to seal the chamber before the bullet clears the neck. Faster powder or more charge/pressure would likely fix this. Closer brass dimensions to your chamber as previously mentioned would help too. You already have plenty of primer though....
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Old 09-13-2013, 10:38 PM
Bronze Member
Join Date: Aug 2010
Posts: 85
Re: Soot on the case body?

All the suggestions are Great. But I see you are using CCI#250 as primer.. I am an avid magnum caliber shooter.. the CCI#250 is a Magnum primer, your caliber is not. Try the CCI#200 or FED210, should resolve your problem. YES I know you could use Mag primers instead of regular primers in some cases.. But 6.5X55?
Silence is not a crime..
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