Last fall, I killed two deer with a puny 6.5x55mm handload-a 125-grain bullet at 2750 fps. One fell in its tracks, and the other went one step and dropped. A week later, I killed a deer of roughly the same size with a .300 Jarrett, a cartridge similar to the ferocious .300 Weatherby, and one which shoots a 200-grain bullet at just under 3000 fps. It has exactly twice the muzzle energy of the little 6.5x55. That animal ran for perhaps 60 yards before she went down, in defiance of all that power. A few months earlier, that same rifle and load dumped a 1,500-pound Alaska moose in its tracks. But it didn't knock the critter off its hooves.