It's been more than two years since I wrote something about the General Purpose Cartridge for military rifles
http://ciar.org/ttk/mbt/guns/gpc.2012-10-23.html
I wanted to hold off so I could improve my ballistic analysis software, collect more empirical evidence, and learn something about the GPC candidates and legacy cartridge upgrades under development by various military institutions, but these developments have been slow in the coming.
When I've had time to spare...
