Problem with carbine loads

[rider]

Here is what I meant by "failure to feed." The case fires, but not with enough force to cycle the action. I have to cycle the operating slide by hand to extract and eject the case and feed the next round. This happens about 10% of the time. I hope this clears up this point.

What you're describing here is a failure to extract or FTE. Feeding is the next cycle, then chambering and firing - or something like that.