Bad ammo

So I have a bad ammunition experience to relate to today. Background: I posted before about me purchasing recently a new S&W Shield 9mm and a near new Ruger P95 9mm. I fired them both once before, and today I took them both again to the range. I used three kinds of ammo, Blazer Brass 124gn FMJ, Federal 115gn FMJ, and Magtech 115gn FMJ, all standard pressure (no +P).

First up was the Ruger P95 with two mags (30 rds) of the Magtech. Almost immediately I started running into problems. From about the fourth round and continuing to the end I was experiencing a lot of failures to eject and stove-piping, about 8 rounds, and 3 failures to fire (light primer hits?). The three misfires all were reloaded and fired the second time. 60 more rounds with the other two ammo kinds went fine with no issues. While once or twice could be a gun related problem, I am certain this many times had to be an ammo problem. I have used Magtech before without issue, maybe this was a bad batch.

I then fired 15 rounds of the Magtech through the Shield with no problems. This is the third Ruger P95 I have owned before, they have a reputation for digesting anything, though this gun may be still in a break-in period (when purchased it may have had only 50-100 rounds put through it by the previous owner and I had only fired 90 rounds through it myself). I have had light primer hit problems before with striker fired guns but never with a robust hammer fired gun like this. Again I am believing this is an ammo problem though it is rattling to experience so many failures right out of the starting gate (11 issues out of 30 rounds).