I've never particularly researched small arms ammunition so Benet priming was something I was very vaguely aware of but really knew nothing about. So I did what most people on a computer do...
I found the following link quite helpful, it discusses cartridge cases and their priming system but for the section specifically addressing Benet priming, use the second link (otherwise, just scroll through the pages until you get to the "Centerfire" label): -
Cartridge Cases:
https://projects.nfstc.org/firearms/...m03_t06_02.htm
Centerfire:
https://projects.nfstc.org/firearms/...3_t06_02_c.htm