The bullets are getting a little gas erosion the the corners of the base. I doubt it is having any real effect on accuracy as it isn't leading to cutting along a land, at least not that I can see.
Not sure what the exact proper term is but there certainly is enough pressure to reshape the nose a bit. The band ahead of the crimp groove is tiny, not even a parallel section before the nose taper begins. After firing the rifling engages the nose is spots the lands don't even touch on unfired bullets.
Not sure what the exact proper term is but there certainly is enough pressure to reshape the nose a bit. The band ahead of the crimp groove is tiny, not even a parallel section before the nose taper begins. After firing the rifling engages the nose is spots the lands don't even touch on unfired bullets.