This coming from a guy who in another post was talking about 100yrd benchrest and shooting at a tiny dot...? When I was shooting 600/1000yrd benchrest, we trimmed and uniformed bullets to be sure they all had the least possible deviation in BC... It's proven different rifling types can cause different expansion responses in bullets, in how aggressively they engrave the bearing surface...

"Marks" left by mechanical gripping tools, especially the grip-n-pull, as in ogive distortions, gouges, scratches, dents, etc... on the bullet anywhere will affect the way they fly. If you have no expectation of precision, sure, bang away. If you want all of your bullets to fly the same, it's best not to have shark bite scars on your bullet.