You can count on one constant with all these "theorists." NONE of them know from Shinola about guns, shooting, ranges, bullet behaviors or ballistics.
Any Marine who has been to Dealy Plaza will tell you that we are talking Very Short Range and that once a bullet hits something it's going to VEER in some unpredictable fashion. These two facts explain all the contortions that conspiracy whackos use to invent ghostly killers on grassy knolls.
Yeah, well, there are exceptions.
Very interesting book, BTW.