The christmas special

I've decided to invent the worlds most dangerous gun. The gun will be really complicated. It will have a targeting system, barrel cooling system, and a automatic voice control system. The kick back of the gun will be so strong I'll have to bolt it into the ground. the bullet will be 3 feet long and 1 foot wide in diameter. The bullet will also have concentrated Nitro glycerin. The gun will be 6 feet long and 4 feet wide. I will tell you how well it works when I'm done.