Yeah, supposedly they will go 30'. While hiking Glacier last year, I had the safety off on the spray and forgot to put it back when I got back to the motel. Long story short, the spray fell off the end table while packing. In a matter of seconds I couldn't catch my breath. I ran out in the hall choking and housecleaning tried to go back in and open the window. She was overcome. They were glad to see me leave
Blowback is a real problem on a windy day, and I refuse to use it under those circumstances.