If you like this idea you might want to look at page 201 in the tenth edition of Cartridges Of The World and check out the .366 DGW. 5800+ foot pounds at the muzzel, and 3253 feet per second in a 24" barrel with a 250 grain slug. 300 grain bullets at 2900+ and the 286 grain bullets at over 3100 it is not too bad. If you want more info on the cartridge let me know. So far it has accounted for 32 one shot kills in Africa, the biggest being a 1250 pound Eland and 12 White tail deel, but then with a cartridge like this do the deer really count? "Yup got my deer with one shot from my Elephant gun" There are also two crows and a wood chuck in this one shot kill catigory but I will not go there.