I was at the range yesterday with my shooting partner. After about 300rounds fired he had occasion to field-strip his pistol (a Smith M&P 2.0).
There was a clear drag mark up the center of the dirty feed ramp. This was clearly caused by rounds sliding up the ramp.
How anyone can claim there is no contact between the nose of the bullet and the feed-ramp is beyond comprehension.
As was stated above...what is the FEED ramp for, if not to FEED the round