Yes this exactly where the bullet is jamming. The width of the feed ramps is fine, it's the sharp corners you highlighted that are the issue. Hoping it would be an easy fix that I can do myself but I don't want to void the warranty through Seekins.
I also have a seekins dmr that's chambered in 6arc. Mine jams the same exact way and leaves the 2 gouges on the bullet. Berger 95gr classic hunters and 103 elder jam the same way. I'm using duramags. Have you found a solution?