Bullet holes and group shape tell the tale

[Bjorn]

He also stated that if you have too much powder then the bullet holes will be real tiny. I have never seen the tiny bullet holes part but he says you need to cut your powder back until the holes become caliber size again. He says that the bullet is over stabilized. Not sure I understand how the bullet holes can get smaller, unless they are losing some of the jacket, than the caliber size but that is what he said.

I have been pondering that as well. Seems like that would violate the laws of physics to have a hole smaller than the bullet that passes through it. But, that guy is clearly the bench-rest expert.