the instructon - " 2 shots to the head a piece " was clemenzas instruction to mike when he met solozzo and mccluskey, not to neri. as for neri shooting barzini, as a former cop, he would have had extensive training with that police issue 6 shot an to nake those 6 shots count at whatever distance that he needed to take his shots. how many times in his career do you think that he had to practice shooting at stationary and moving targets at all distances.