Bolt face stripping brass

[DaveTooley]

Tim
Remove the ejector and take something with a small point on and check all the edges for a burr. Including the partial hole the ejector goes in. If there's a burr you should be able to feel it. I'd use the razor knife I keep on the bench.

 

[misser]

I have a new DS that is stripping brass
I polished a little with 1000 grit. It got a little better. Am I missing something?
or just needs a bit more polishing

neck sizing ?

 

[Tim Singleton]

neck sizing ?

Full length sizing.

 

[AlNyhus]

Tim, does the face of the ejector go below the bolt face if you push it down?

 

[Tim Singleton]

Tim, does the face of the ejector go below the bolt face if you push it down?

Yea i checked that first thing

 

[Tim Singleton]

In normal operation
When the case is fired does it expand out come back off the walls and rotate with the bolt?
Or just expand out come back and the bolt rotates against the case without rubbing it

 

[LVLAaron]

Strip that bolt down and give it a good cleaning.

 

[AlNyhus]

Tim, the case stays in place and the bolt and extractor rotate around the case until the mechanical camming (primary extraction) happens. Sometimes, you can get a little 'spring' extraction as the lugs clear the abuttments but before it comes up on the mechanical camming.

It's possible the face of the bolt may not be perfectly flat. Have you removed the ejector and fired a few rounds that way? Another thing to check is how deep into the case extractor groove the actual ectractor goes. You could remove the extractor and fire a few that way if there's any question about that.

 

[243winxb]

Or just expand out come back and the bolt rotates against the case without rubbing it

Put an index mark on the side of the brass & case head & fire. Does the mark stay at 12 oclock or turn when ejecting the brass?

Fired brass should spring back after firing. But will not as pressures go over 76,000 PSI.

Does the extractor allow enough clearance for the thickness of the rim, plus a few thousandth?

 

[Tim Singleton]

Tim, the case stays in place and the bolt and extractor rotate around the case until the mechanical camming (primary extraction) happens. Sometimes, you can get a little 'spring' extraction as the lugs clear the abuttments but before it comes up on the mechanical camming.

It's possible the face of the bolt may not be perfectly flat. Have you removed the ejector and fired a few rounds that way? Another thing to check is how deep into the case extractor groove the actual ectractor goes. You could remove the extractor and fire a few that way if there's any question about that.

Will do

 

[misser]

I did have this one new bolt gun that had a problem ,returned it for inspection , I was contacted and was told they could not find any thing wrong . they were checking head space .I then said look at the bolt face . that's when they put a new bolt into it as the one that came with was out of spec.

 

[Alex Wheeler]

Tim, on the pictures of the brass I see multiple ejector marks and even an extractor mark. If brass is flowing like that the boltface is going to shear it off. Take a piece of 400 and glue it to a dowel and spin it in the boltface. Go easy. That will smooth it out but not stop.the cuts from shearing extruded brass. Your bolt is square and flat. You would know if it wasnt because you would have bolt lift issues at any pressures. Main thing I see is pressure signs on the brass. Normally an extractor mark comes after an ejector mark. Usually really high pressure. Whats the load?

 

[jmill21]

I have a new DS that is stripping brass
I polished a little with 1000 grit. It got a little better. Am I missing something?
or just needs a bit more polishing

I would be contacting Bat. That bolt face does not look good.

 

[Tim Singleton]

Tim, on the pictures of the brass I see multiple ejector marks and even an extractor mark. If brass is flowing like that the boltface is going to shear it off. Take a piece of 400 and glue it to a dowel and spin it in the boltface. Go easy. That will smooth it out but not stop.the cuts from shearing extruded brass. Your bolt is square and flat. You would know if it wasnt because you would have bolt lift issues at any pressures. Main thing I see is pressure signs on the brass. Normally an extractor mark comes after an ejector mark. Usually really high pressure. Whats the load?

A medium load for what I normally shoot 29.7 of N133-2024yr
around 3400 fps or just under 68 grain bullet
I noticed it when the bolt failed to eject and was stuck by a piece of brass. It will shave Norma too, not as badly, but it will
I've got some Lapua ready to go to the range Friday

 

[Tim Singleton]

Tim, on the pictures of the brass I see multiple ejector marks and even an extractor mark. If brass is flowing like that the boltface is going to shear it off. Take a piece of 400 and glue it to a dowel and spin it in the boltface. Go easy. That will smooth it out but not stop.the cuts from shearing extruded brass. Your bolt is square and flat. You would know if it wasnt because you would have bolt lift issues at any pressures. Main thing I see is pressure signs on the brass. Normally an extractor mark comes after an ejector mark. Usually really high pressure. Whats the load?

Bolt does lift easy even up at 30.5 of 133

 

[Alex Wheeler]

Bolt does lift easy even up at 30.5 of 133

Im no ppc expert but those ejector marks are pretty healthy for those powder charges.

 

[AlNyhus]

But strangely, the lettering doesn't appear to be 'ironed' flatter like a very high pressure load does....

 

[Tim Singleton]

Polishing it a bit more seems to have worked

 

[boltfluter]

Looks like burrs from the ejector hole and the extractor cut. Must have been a Friday afternoon bolt face job! QC must have been Mia as well. Party on !!