Out of curiosity, what type of bullet would you use for a close range (muzzle to 25 yards) self defense setup. I am interested in something that would have the least likely chance to penetrate a wall. Also my rifle is 1:7" twist. So obviously 62 grain penetration rounds are out. I would also say the 55 grain FMJ is also out. I picked up some 50 grain polymer tipped varmint rounds from American Eagle What about the hollow point rounds? Can those tiny holes really allow for rapid expansion? Frangible? Soft Point?