You will find here a couple of links tthat will help you understand what the SBT is really all about.
http://mcadams.posc.mu.edu/sbt.htm
http://karws.gso.uri.edu/JFK/Issues_and_evidence/Single-Bullet_theory/The_SBT.html
http://karws.gso.uri.edu/JFK/issues_and_evidence/single-bullet_theory/Pristine_bullet/Pristine_bullet.html
http://karws.gso.uri.edu/JFK/Scientific_topics/NAA/NAA_and_assassination_II/NAA_and_assassination.html
http://www.jfk-online.com/jfk100sbt.html
http://karws.gso.uri.edu/JFK/Issues_and_evidence/Back_wound/Need_to_know_height_back_wound.html
http://karws.gso.uri.edu/JFK/Issues_and_evidence/Single-Bullet_theory/Line_of_damage/Line_of_damage.html
http://mcadams.posc.mu.edu/Lattimer.txt