Yep, my howas do this. 6.5 Grendel likes putting ejector stamps on everything - even factory ammo and mild reloads - despite primers looking absolutely fine. It leaves a nice shiny ring around the primer as you've pictured, maybe 1/4 of the way around. 223 and 308 bolt faces leave the rings at least 3/4 of the way around cases and collect brass (but don't leave any ejector stamps).
Would be interesting to get a gunsmith's opinion.
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