My son sprayed a charging grizzly that got to within 10 feet of him. It hit the spray and veered of to the side and over a hill. He saw it about 10 mins later, and it ran off. Not a hunting trip, just hiking. It was a very large male bear.
Only grizzly I got close to ran off. Did have to shoot a charging black bear with my bow. I figured that I didn't need spray as it wasn't grizzly country, but I was wrong. Had a few run ins with mountain lions where the spray would have been handy.
Reading
@Irishman's post made me remember the one time that a black bear charged me...
I was working for the Forest Service and one Friday afternoon I was driving back to the office and saw 2 of my co-workers parked on the side of the highway. I thought it was odd for them to be there so I turned around to see what was going on.
They said they heard on the FS radio that a member of our trail maintenance crew had been attacked by a bear, and they were waiting for our Law Enforcement Officer to get there.
A few minutes later our LEO and a Sheriff Deputy arrived. The LEO knew that I was a hunter and shooter and he gave me his AR-15 and he and the Deputy had shotguns.
We all then started up the trail. The trail maintenance crew were 3 college students working a summer job of cleaning backcountry trails. The crew was 2 guys and a girl.
When we got up to the crew, 1 guy and the girl were up in one tree and they had their FS radio. The other guy was 50 yards up the trail and he was close to the top of a very tall spruce tree. He was the one that had been attacked by the black bear, and 3 times he had yelled for help from the top of the tree, the bear had climbed up and bit his boots and legs.
By the time the LEO, Deputy, and I got to the trail crew it was over an hour since the bear had first attacked the crew. When the LEO, Deputy and I got to the guy that had been bitten, I was in the lead and saw the bear first and it was charging us. I yelled "Here comes the bear!" and the 3 of us all shot at the same time, killing it.
We then got the injured crew member out of the tree, took him down to where the other crew members were, and gave him first aid. We were then waiting for a medivac helicopter from Yellowstone NP and I went back up to where he had been attacked.
I then saw why the bear had attacked him. I saw a little black cub run through the brush and up a tree. The lead crew member had gotten between a mother bear and her cubs. I immediately felt sorry for shooting a mother bear, and I was afraid that someone would want to shoot the cub, thinking that it wouldn't make it on his own.
So I climbed up the tree and caught the cub. Once I got him to the ground he started biting and scratching me. His little teeth felt like nails in a vice jaws when he would bite me, so I had to keep a firm grip on the back of his neck with one hand. And unless I kept a firm grip on his back feet with my other hand he would use them to scratch me.
I must have held him for at least an hour before the FWP bear biologist came up with a plastic 5 gallon bucket that we could put the cub in.
The next day FWP took dogs up to the attack site and found and captured a second cub. They took both cubs to a wild animal recovery place in Helena where they kept the cubs for 2 years then released them in the forest there.
The injuries of crew member that had been bitten were not too serious and he recovered OK. Schnees in Bozeman gave him a new pair of boots.
I had to take a prescription of penicillin pills and get a tetnus shot, but I can truely say that I caught a bear.
