I don't know tex, i see these every now and then myself. Looking at them both now I believe that if they did catch the collar during ejection they would need to have the mark going the opposite way toward the reverse since the collar falls down and it is face up when struck. Unless they are striking them face down now. Maybe @paddyman98 will know.
Paddy made a thread about finned rims. The answers are probably in there. Off hand these don't look finned.