Encasulated base means that the base is has no exposed lead. That is significant for indoor range shooters in particular since some of the exposed lead is vapourised during firing. Encapsulating prevents this. Truncated cone (literally cut off cone) produces a flat surface that will to one degree or another replicate JHP feeding and punches very nice, distinct holes in paper targets. Those are good things for training. Combining the two features produces an excellent ammo choice for indoor training.