What to do with a mark from the bolt on a brass casing

[bigHUN]

I am ready to reload the next batch 308, the brass is fully prepared through the entire cycle, and out of boredom I just did a very last inspection with a high power jewellers lupe before start loading with powder.
And this what I discovered that some (maybe 10 out of 100) casing has marks.
Without a lupe - only with reading glasses, I can see only now the marks from the ejector because I learned what and where to look for it.
I cannot recall for difficulties ejecting from chamber. The spring in the bolt I replaced with new- a bit stronger, last winter.

Win 308 SA
Lapua brass, inherited, about forth or fifth reload so far as much I know, two refills in my hands, both were annealed.
Sierra Match 155 grain
Varget 45.8 grain powder
CDI large rifle primer BR-2
Seating depth 0.028"
All my reloading tools new from Wilson, and I am very picky when doing things.
About consistent <0.3 MOA @ 300 meters in all weather conditions averaged over a 100 shots.

My Q:
Would it be worth to repeat again a leader test with less powder, or just separate these brass into a new batch?

 

[BattleRife]

Ejector marks are usually taken to be an indicator of excessive bolt thrust. Your pressure may be high, or you may have had lube left on the cases. This is the illness you have to deal with.

The mark itself is just a symptom. There is nothing wrong with the brass. Fix whatever caused the high bolt thrust and use the brass as normal.

 

[tiriaq]

The plunger ejector does not support the case head upon firing, so there is essentially a hole in the bolt face. If you have to use a loupe or reading glasses to see the imprint, I would not worry about it. If the mark has a wiped appearance because the brass was extruded into the hole and then sheared when the bolt was opened, I would be concerned.
The load you describe is a very reasonable one. Any possibility that the marks were there when you inherited the brass?
Incidentally, 100 rounds averaging less than a third minute at 300m is absolutely outstanding.

 

[bigHUN]

I prepared these amo for August tournaments in my mind, but my chemo did some stomach swellings and could not prone. Two months later I was much better shape and shot the entire batch from a 300M bench .