Long time ago I watched some old timers in the neighborhood shoot 5’ oxygen tanks into Lake Michigan like torpedos. They had built a ramp out of angle iron mounted in the back of a pickup truck. Ramp surround the tank on four sides with thevalve end exposed. Theyd stand outside the truck bed and wack the valve off with a wood splitting ax ducking behind the bedside.I don't SCUBA but a 325cf ARGON cylinder weighs over 300 pounds and is pressurized to about 3000 psi. You don't want to pick it up by the valve. My supply house will not let you on the property if you have a tank with the valve exposed. Break it off and it's an unguided missile.
Those tanks would shoot acouple hundred feet some a perfect trajectory some would skip and flop around. I was a teenager at the time and thought it was crazy but pretty cool to see. I had bad role models