I have had 3-4 hang fires in the last 250 or so rounds. 2 different bullets but both loaded w/accurate #7 and federal primers. I am shooting them in a Glock 19, no mods whatsoever. There is about 3/4 to 1 second delay between click & bang. The powder is 10+ years old & stored in a cabinet in a cinder block shop & im thinkin that may be the problem. Should I be looking at the primers, what do yall think? I have never had hang fires before & now all the sudden im eat up w/em.