Draw a sharpie ring around the case where the scuff mark is and slowly advance it until it touches the chamfer. Probably about where the pop happens. Are you full length sizing? You probably already did but pull the pin assembly if it’s a loaded round.
The issue is not the chamfer. The nose of the bullet is contacting the top of the chamber while the case is still constrained by the feed lips, wedging it into the chamfer. Long bullets seated way out and straight cylinder shaped cartridges make it worse. You need to mess with the magazine and...