I was impressed by KelTec Sub2000, a foldable rifle that eats 9mm rounds or 40SW. With the 9mm 115gr, it can move the bullet to 1500fps which is 575ftlbs. Seems like an efficient conversion of the 9mm cartridge power to kinetic energy. I would be interested in one that can eat 10mm rounds, and if it can do with the 10mm what it does for 9mm, such a rifle can bring 10mm energy toward 44mag type of energy for woods defense. Have you heard of any other brands that takes 10mm Auto?