Bullet holes and group shape tell the tale

[jasper2408]

The part of the video I thought was informative was where he was talking about how to tell if the bullet you are shooting is being stabilized or not. He says that if the you are getting a round top and a square bottom on the bullet holes (looks like the bottom of the hole tore the paper in a square) then it is not stabilized. I can understand that. He says you need more powder in that instance. 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.