The question of ''accepted uniqueness'' of several types of GSR partic
les is discussed. Based on our experience, we propose to include GSR p
articles formed in firing the Sellier Bellot, Prague (SBP) ammunition
in the group of ''unique'' GSR particles. With the advent of autosearc
h systems for GSR analysis in crime labs, a better statistical basis f
or the extent of uniqueness of various types of GSR particles may be a
chieved.