Reply from a friend of mine...
"I was told from the production line assemblers @ RAAP, Radford Army Ammo Plant Va., that primer weight consistency is what determines Match Primers from the Standard and Magnum primers. Match primers are weighed and sorted by the line worker. The most consistent primers are sorted as Match. The assemblers on the line that produce the Match grade primers receive a production pay bonus. So all want to make the tightest tolerances. Also burn characteristics "brisance". Digital display equipment would show the sear break, the firing pin contact to the primer, the detonation of the primer cup pellet, the rise time of the primer cup pellet, the burn time and the decline, the fire particles into the cartridge propellant, rise time, duration and chamber pressure curve. I worked at RAAP as a Test Measurement Diagnostic Equipment Supervisor and later as a Auditor Inspector. ISO and Army Regulations. All measurement parameters, test equipment, arms gages and ammo gages.
A neat place, but no free samples! A good bunch of folks.
Hercules, Alliant, ATK.
Don't want to weigh, just go with Match Primers, the work has been done for you.
Brisance
Brisance is the shattering capability of a high explosive, determined mainly by its detonation pressure. The term can be traced from the French verb "briser" (to break or shatter) ultimately derived from the Celtic word "brissim" (to break). Brisance is of practical importance for determining the effectiveness of an explosion in fragmenting shells, bomb casings, grenades, structures, and the like. The sand crush test and Trauzl lead block test are commonly used to determine the relative brisance in comparison to TNT (which is considered a standard reference for many purposes).
