Is there a method that the FBI (or anybody, for that matter) uses to measure the amount of fragmentation of a round as it strikes Ordnance Gelatin?

For example, if they say the bullet was 100% fragmented, how is that different from 90%?  Did 10% of the bullet stay perfectly intact?  

Or do they go on the weight of the fragments--say, 100% fragmentation means that all fragments were under Xgrains in weight?

Somebody please explain how testers quantify their fragmentation tests...

Fragmentometer

ColtShorty

GOA KABA COA JPFO SAF NRA

"I won't be wronged,  I won't be insulted
and I won't be laid a hand on. I don't do
these things to other people and I require
the same from them."