False Positive Pressure Signs

[lancetkenyon]

New virgin brass?

 

[Gstew1930]

New virgin brass?

2nd firing

 

[Gstew1930]

How about a little brass on the bolt face? Would that mean there's a good chance I have a burr or is this normal? I honestly don't think I've ever paid attention to this in any of my rifles

 

[orkan]

Brass on the bolt face is expected, accepted, and fine... as long as its mostly uniform on the bearing surface of the head.

You'll notice more in your picture, right around the ejector pin hole though... that's a clue. Sharpness there is grabbing more than it's fair share of brass.

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[Alex Wheeler]

Bolt faces that are not square or flat can cause heavy bolt lift too. It only takes a few ten thousandths. Customs are not immune to any of the same issues as factory actions. Orkan is correct, cnc doesnt mean perfect. Far from it. Lots of different issues with custom actions.

 

[sedancowboy]

This is an excellent thread! Thank you Orkan!
I just experience this with a new CA rifle. Polished the the ejector and deburred the ejector hole and polished the bolt face to remove the Cerokote. Now the rifle functions as it should. Also some times the ejector is proud of the bolt face it should be flush and polished.
Also the with fixed ejectors the slot in the bolt face can have burrs on it causing the same swipe on the brass.

 

[Gstew1930]

Ok Orkan, I've got another one for you. New rifle with a different type of ejector. I'm pretty sure i know the answer but we'll see. Action is American rifle company arcimedies. Primer looks good. Easy bolt lift with a pretty shiny ejector mark by the C in creedmoor

 

[orkan]

Ok Orkan, I've got another one for you. New rifle with a different type of ejector. I'm pretty sure i know the answer but we'll see. Action is American rifle company arcimedies. Primer looks good. Easy bolt lift with a pretty shiny ejector mark by the C in creedmoor

Looks like real pressure to me. Remember, pressure isn't where the internet says it should be... it's where the brass says it is. Peterson tends to be a little on the softer side, and that case head is showing pressure as well as the primer. See how the primer firing pin indent has a little crater on it... and the edges are kind of sharp? It's not massive over pressure, but its definitely showing. Bolts with fixed ejectors have unsupported areas on the bolt face, which tends to lead softer cases to show pressure a little earlier. It's possible that after 3-5 firings at lower pressures, the case head will be hardened up enough to where it won't show as bad.


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[Gstew1930]

Looks like real pressure to me. Remember, pressure isn't where the internet says it should be... it's where the brass says it is. Peterson tends to be a little on the softer side, and that case head is showing pressure as well as the primer. See how the primer firing pin indent has a little crater on it... and the edges are kind of sharp? It's not massive over pressure, but its definitely showing. Bolts with fixed ejectors have unsupported areas on the bolt face, which tends to lead softer cases to show pressure a little earlier. It's possible that after 3-5 firings at lower pressures, the case head will be hardened up enough to where it won't show as bad.


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Ok I'm following you! That makes a lot of sense. I appreciate your help

 

[p47dman]

What are your thoughts on this? Thanks.

 

[orkan]

Looks like pressure to me. Cratered primer looks right on the edge of piercing.


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[p47dman]

Factory ammo, Hornady, shot from CA Ridgeline.
Heavy bolt lift, to the point I needed to bring a rubber mallet to the range to tap bolt open. As the rifle heated up, it would get worse. Groups went from 3 shots touching to 12" by the 6th shot.

 

[Rflshootr]

What are your thoughts on this? Thanks.

Looks like you're about to have a failure.

 

[p47dman]

That is what I told CA. Fought with them through 3 barrel changes. They finally refunded my money and kept the rifle.