I have attempted to get a subsonic load that cycled the action of my AK and I was unsuccessful, but.....
Here are a few questions:
Are you running a rifle with suppressor?
Are you running fairly new springs or a very lose gun?
Are you running a rifle with gas shut off?
One day, I shall come back. Yes, I shall come back. Until then, there must be no regrets, no tears, no anxieties. Just go forward in all your beliefs and prove to me that I am not mistaken in mine.