I have tested several brands of 9mm in my R9S. While testing Hornady's "Critical Defense" cartridges I was pleased with its accuracy. However, with tese cartridges - only - I have experienced one out of every 5 to 6 cartridges failing to go off. About half of the time, the cartridges will go off with a second pull of the trigger. While checking those that fail to fire, I found light strikes on the primers. Does anyone know if Hornady's primers are slightly too hard, leading to the occassional failures? (Or is my pistol defective). These bullets expand reliably through heavy or light mediums, but the failures to ignite would throw them out the window for reliable defense purposes.