I have come to the conclusion that this problem boils down to connection quality, and applies to all rounds, not just 30mm.
Some nights a short squirt kills, others I hose away hit sprites all over and nothing.
The other night I was chasing a 234 in a komet and saw distinctly 2 hits on the left wing and 1 on the right and ended up just smoking the two engines, normally the wings would be gone.
My squadies probably think I'm nuts when I say things like "wow my rounds are hitting hard tonight" or "dang, rubber bullets tonight".
Me thinks packets hide sometimes.
shamus