Just looked at a big can of this at Walmart today. Instructions said 30’ maximum range. It is supposed to spray steady 5 seconds.
Much of this seems to be operator error. The bear ran when sprayed in the face.
I used to live in wooded big bear country. A bear came out of hibernation one February and left tracks beside the house in the snow and across the lake. A game cam snapped it about a mile away, a 500 pounder.
The game wardens said they get hungry, wake up sometimes unpredictably, vo eat some more, and go back to hibernation. I carried a .44 mag every time I walked out to the pole barn the rest of that winter.
I also carry a 28,000 lumens LED flashlight which is also called a bear stopper. It’ll blind them it’s so bright.