No, I didn't invent it. It started out life as a 7 X 30 Waters and was converted by "he who can't be mentioned on this forum". Yes, it shoots like a house on fire, upgraded the scope to take advantage of the extra range. It is a true 200 yd antelope / mulie cartridge. It was a toss up between this and the 30 cal version. Found a 7 X 30 before I found a 30/30 to convert. Very pleased with downrange performance and the cases are easy to form.