In all honesty, I wasn't paying enough attention to the 5.45 shooters' targets to come to a conclusion with any degree of certainty. I know that my 7.62 rifle had no problems, performance or accuracy issues, during the class for the rifle & ammo combo remained as accurate as I was throughout.
The only problems that I saw and can recall that occurred with any of the rifles during the class were:
1) Trigger pin walked out and was lost from a Jim Fuller WASR of all rifles!
2) Bulgarian AK-74 with a disconnecter that had failed and not allowing the trigger to reset properly.