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Smoke on case

I'm getting smoke on the case below the shoulders. This occurs on the first two or three shots and stops. This is on a 6.5 creed with 2000 rounds and started at around 1900. Brass is Lapua and only 4 times fired. It only occurs on a cold barrel. Clean or dirty. I have a .243 with 1500 that does this also. Only the first couple. No changes to load or dies. The shiney ring down low is a reamer mark not stretch.
 

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Mike
I recently had the same problem with my Ruger PRP 6.5 Creedmoor at 2,000 rounds. I called Ruger and as a result sent it back to them for a new barrel. Seems the throat was burned out. Using a bore scope. I could see the damage on the left side of the barrel. They replaced the barrel and went over the entire rifle replacing a few other parts and sent it back for a little over $400.00. Now shooting 3/8 groups again.

From looking at the 2nd photo it looks like you are also have a problem on one side of the throat as the ring of carbon is not completely circled the case.

Nick
 
Not getting a quick neck seal. Are you trimming the brass a lot, or maybe changed the trim length recently?
Any changes?
 
If it is not getting sealed off, how could it be uniform?
This is not sealed...looks uniform to me...
Q6SkR.jpg
 
I'm getting smoke on the case below the shoulders. This occurs on the first two or three shots and stops. This is on a 6.5 creed with 2000 rounds and started at around 1900. Brass is Lapua and only 4 times fired. It only occurs on a cold barrel. Clean or dirty. I have a .243 with 1500 that does this also. Only the first couple. No changes to load or dies. The shiney ring down low is a reamer mark not stretch.

My guess is the throat has become worn or "broken in if your glass is half full" after 2000 rounds and thus lowering the chamber pressure. I would increase the powder charge and see if the soot on the shoulder and neck disappears. Or seat the bullets out further and raise the start pressure and seal the neck, or a little of both.

I see the same soot on my cases when making workup loads and starting at the suggested starting loads and working up. Or my 30-30 cases at 43,000 psi, meaning lower chamber pressure cartridges.
 
So perhaps I lied about changes. I do chase the lands. I started at touch and I'm .025 chase now. Pressure could be alitte low I guess. A friend said carbon ring, but I don't have a borescope. I don't know what's up but I'd like to know. The .243 is a Howa and sits in the safe as its accuracy is toast with 1500 rounds.
 
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I'm with big ed on you need more powder to seal it off. And with Dusty on cleaning your chamber thoroughly.
Has the gun experienced a pressure dump, loss of speed at 1900rds, could explain a lot of this?
Nothing good has ever came from gassing your chamber.
 
A mild load is most likely what's causing the carbon , you could goose up your loads but if their shooting good just clean after every firing . Some things you don't have to worry about . Just shoot straight .
 

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