Hi Jer, it was really inconsistant? I suspect it was all happening in the tube, but in a kind of, "grab and let go" type of malfunction? I can easily make the test rounds shorter, but then it wouldn't be a good benchmark ammo for testing. I know now to just go with the shorter ammo in the AEG testing... maybe more on that in the future... best to you jer, til....lat'r...GT