First don't get me wrong it's not a question of 30mm effectiveness, it's a matter of "are the 262 30mms" counting towards "Hit %" in fighter.
First and only fighter sortie of the tour was in a 262, landed 3 kills after nailing Lancasters with taters of fury... 2 torched and last on wing annihilated...
I waited to see if they showed up on the full-stats on the HTC stats page, yet is still doesn't show that any of my rounds landed against any enemy aircraft while in fighter mode.
The one time I actually hit something with taters....