"Haha! We are a danger to ourselves and those around us!"
But hey, it's still a fine weapon: After all, the problem isn't that it doesn't kill what you're shooting at, just that it quite possibly kills you and all of your friends in the process. It's kind of the same process as a honeybee leaving its stinger -- just replace the stinger with high explosives and the honeybee with four drunken idiots.
The round was originally designed to stop the headlong charges of big game, but we'll let this review speak to its effectiveness there: "It is not at all clear that [the T-Rex Round] will kill an elephant or a buffalo or a hippo any better than a well placed hit from a 470, and, of course, it will not do anything with a badly placed hit except annoy the recipient."
So basically, the Tyrannosaur round is only for dipshits who need to overcompensate for something more than they need working arms to shield their faces from angry bears, or else it's for expert hunters who have become so jaded by their excessive prowess that they feel the need to handicap themselves. Possibly literally.
"These unbroken hands are an unfair advantage."