I can certainly believe in the possibility that Hitler survived WWII. Lots of men, who,are interested in gaining power and wealth wouldn’t be above allowing a monster to get away.
Another “super bullet”. It is like the carburettors that run on water and get 200 miles per gallon of gasoline.
Some people just want to believe that the can get something for nothing. Expanding bullets are better at dumping more energy into the body, and they give up penetration in order to do it.