Ejector Marks/Stuck Ejector

[Csafisher]

So I’m getting some ejector marks and what’s worse is that it’s shaving tiny pieces of brass off and it’s getting around my ejector and making it stick in the down position. This is a Terminus Zeus in 6GT. I’m running alpha brass with 105 Bergers and 32.5grs varget at 2840. .020 off lands. No sticking no heavy bolt lift. This is the 2nd firing. I need to measure growth but once fired brass only grew maybe a thou or so. And this brass still fits and chambers. I also had the same marks at 32grs.

What do y’all think?

I’m hoping the brass is just too short and bounces back hard. But it’s getting annoying. Last couple matches it stopped ejecting during a stage.

 

[Rio Precision Gunworks]

This is OCD or gen 1 Alpha?

Probably need to measure chamber and brass. Unless there's something like tight bore, carbon, or moisture causing pressure to go high, you shouldn't be in any danger with 28.5gr varget.

Also, is the ejector just dirty, or damaged?

 

[Shoots 700's]

How far are you setting the shoulder back during resizing?

 

[Csafisher]

Ejector is just dirty.

After 1st firing I didn’t bump the shoulder. Just body. They didn’t grow enough to need a bump.

 

[akz28]

If you load a prepped case into the chamber (no primer, powder or bullet) and then eject it, does it make the same mark? My 6.5cm was doing this. Strong ejector pin spring was causing mine. Not pressure.

 

[Slides]

Although the primers aren't flattening they do appear to be starting to extrude around the firing pin back into the (loose?) firing pin hole a bit, given the swipe and photos the cases are actually extruding back into the ejector hole too. Is it very soft brass? Hogdgon is showing 34gr Max load for 107s so it sounds like soft brass.

 

[RegionRat]

Just a suggestion.
If your loading gear can be portable such that you can load at the range.... I would take about three to five cases and run them for several cycles to eliminate the prep and headspace issues.

If your headspace is still very generous and the brass is moving back and forth, it might explain the cosmetics of those firing pin marks and also the ejector marks. Getting several cycles on your brass will either resolve this or it points to soft brass or pressure. It can be annoying if a rig has a habit like this on virgin brass.

It is possible the bolt face ejector hole detail is rough, or that the sizing/prep has to develop, or that the brass hardness is low, or a combination of these. Sounds like you should keep your bolt maintenance tools close at hand for the time being so that you can keep that ejector area clean.

Your load and speed sound like they are reasonable which tends to lower the pressure as a cause, although we should watch everything till you have this resolved. Good Luck and in for the range reports.