In the top pic, it looks like that shell had been ran through more than once and possibly caught on the extractor slot on the first go or a previous go (the bulge on the right at the feedramp, in relation to the pic, not the right of the weapon). If what I think I am seeing is what I am really seeing, they basically skipped a step at the chamber end or decided that it didn't matter enough to copy. Maybe they tested the early ones with very stiff-hulled loads and it simply wasn't an issue that needed to be addressed, from their perspective.
In this pic, the grayish pink is what I think is