Had a problem today during match. Take some shots then I'd have either a click or nothing at all. Rack it, shoot it then click or nothing again. Happened a couple times with 1 mag. Took mag out of use. Then it happened with other mags. I started looking at bad rounds and noticed some had primers not quite seated all the way. A couple even had light firing pin hits but they were off to side of primer. I checked my spent brass and they all had good centered primer hits. My equipment list. Glock 21 Gen3 and switched to G30S Only mod is ext mag button Using my reloads (I stripe my reloads with marker across head stamp) Day before match gun ran perfect but was using store bought ammo. Any ideas as to why/what is happening?