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The brass was cleaned, sized & d-primed, primer pockets reamed and trimmed to length if needed. Then loaded, so brass neck would have been expanded 2nd time before seating the bullet.
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Excessive seating force caused the seating plug to mark the bullets. Cause? You didn't say if you inside chamfered the neck!? In fact, I KNOW you didn't! See the scraped jacket material at the bullet/neck junction? The square neck is digging into the bullet, scraping copper off the bearing surface of the bullet.
Are they safe to shoot? Certainly. The worst outcome would be increased bore fouling by the free copper in front of the bullet, and the scored jacket caused by the sharp/square neck.