Help diagnose markings on spent cases and build of the week

[Dcommoncents]

Thanks for the comments. The dents on the body only appeared after my most recent outing with this rifle. I was thinking it might be an over gassing issue, so perhaps I put a lighter buffer in it and forgot, I'll have to double check.

I'll try to narrow down the cause of the neck scratches as suggested. If it is caused by the lugs during feeding, what do you suggest? Perhaps some light polishing on the corners of the bottom lugs?