I killed a Brown bear, with a .270, 30 plus years ago. Was hunting moose and came across a Brown bear with inflamed hemorrhoids. At least that is what it seemed like at the time. He charged and I responded. I killed the bear at less than 20 yards, with a single shot from my .270. Went right into his left eye and into his brain. Lights out. I was 100% lucky. Being a young fool, from back east, I had my scope cranked up to its highest power when I was walking through the bush. You try finding a Brown bear at 100 feet that is charging you, with a scope cranked up to high power. It was all a blur until I recognized an eye ball. Then I shot him. It took me ten minutes to stop shaking enough, to light a cigarette. I had no choice but to shoot him. Buddy was off looking for a Brown bear, I was after a moose. He claimed this one on his tag. Funny thing is my buddy recounts the story and he is now the shooter, not me. Wish he had the nightmare I had for a few days. Being close to becoming bear scat is not fun and unless you see it for yourself you just can not believe how fast a brown bear can move. Never did get that moose. That 9mm might slow him down but i would rather skip ever finding out myself and hope you boy does as well.