Check out this gem from the genius's web site:
His recommendation is to load up TWO of these! You'd have to rack the slide not once but twice!That is why I invented the Safety Bullet®. If you keep your gun loaded, put a Safety Bullet® in the firing chamber and one at the top of the magazine. If anyone pulls the trigger the gun is locked up. If anyone cycles the action and pulls the trigger the gun is locked up.I know the Safety Bullet® is loaded in my firearm, so I cycle the action twice; once for the bullet in the chamber and the second time for the bullet in the top of the magazine.Two seconds is all it takes, and with practice, one second.