I pulled some key points from SAAMI that is good reminder and bold a couple points:
1. Primers may explode if subjected to mishandling.
Explosions may be caused by friction and by percussion,
such as hammering, pounding, dropping or bullet impact.
Heating by fire, static electricity, sparks, hot tobacco
ashes, or other unspecified abuses may also cause
primers to explode.
2. If primers are loose or in bulk, having contact one
with another, one primer exploding can, and usually will,
cause a violent, sympathetic explosion of all primers so
situated. In other words, one primer exploding for any rea-
son under these circumstances will normally cause all of
the primers to explode in one violent blast.
3. Primers may "dust." Small particles of priming com-
pound may separate from the primers in the form of dust,
especially when they are subjected to shaking or jolting.
Accumulation of this dust in primer feed tubes, loading
machines, and loading areas is extremely hazardous as it
might cause explosions or fires.
Precautions should be taken to avoid buildup of static
electricity on the person when handling primers or con-
ducting handloading procedures. Loading equipment
should be electrically grounded.
I am now going to audit my bench! I "think" I am OK, but will feel whole lot better looking it over with specific intent from SAAMI. I will be cleaning primer tubes today just as precaution. Steel table on concrete so feel OK there.
but I may add ground strap to table leg.
If you are loading on a bench over a rug, grounding is critically important.