Colorado
My god man you are quick to anger! It is my belief that AD is simply saying that your idea is not a pratical one and we should move on.
I have shot leopard and had the experience of following up a wounded one. In following a leopard hit poorly it is almost always dark. If you leave the cat until next day you could very well loose your trophy to hyena or other scavengers in the night. The eyes are what gives away leopard in the dark. With this you want an pin point shot with shock. The PH will be the one carring the stopper and they have the experience on what to choose.
I agree with AD I believe the project gun you have suggested is totally too costly, impratical, and useless for the modern day Safari hunter and we could do better by moving on to another topic.