Titan, dont plant false illusions.
In a 109, you have to hold your bullet stream on the Spitfire, one crossing snapshot with one 151/20 wont kill it, unless you get lucky and hit the pilot on the head. Ergo, you (or me, as talking from experience) have to create 2-3 good snapshots in most of the cases. Thats very difficult since the Spit turns, accelerates, rolls much better than a G6, and still quite a bit better than the F4. Against a more or less equal pilot, it was next to inpossible for me.
Of course, if you have energy on the Spit, even more, he ropes himself up right to your guns, one 20mm cannon is more than enough to kill an aircraft. But 2 of them are twice better
