I have about 1000 rounds of 7.62 German surplus ammo marked "DAG-69-22" and a NATO cross. The primer has a green sealant and is crimped.
It is decently accurate practice ammo but about 10% of the ammo does not fire on the first try. My best guess is that these primers are just old since I do get a good deep firing pin "impression". I do not have this problem with any other ammo in my rifle just these DAG69 rounds. So what is the best situation to handle this on an AR15 platform. Things I have tried:
1) Pull the charging handle back about an inch, enough to recock the hammer but not so much as to eject the round. Then let go of the handle and re-fire. The problem is that AR15 has free floating pin and I had the round fire "by itself" after letting go of charging handle. I am also concerned this might cause some kind of out of battery discharge (no bolt assist on my rifle)
2) Wait 10 seconds to make sure the round will not change its mind then eject it. Then at the end of magazine collect the unfired rounds, reload and fire. Problem is I am not all that enthusiastic about handling these almost but not quite exploded little brass grenades.