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Re Stanford Tuck: he was bloody lucky the Germans didn't shoot him on the spot. Destroying a distillery - bastard!
Not sure how Bader's renowned tenacity is relevant to his marksmanship, but certainly an exceptional character. I believe one RAF pilot scored kills after losing an arm!
I would stipulate that it is extremely hard, if not impossible to hit point targets with the .303s in the Spit, EXCEPT by spraying the target area profusely and hoping one of the hundreds hit the point you were aiming for.
The basis for this claim is that the mounting structure of the Spitfire wing was such that the Colt-Browning MG vibrated so badly that the "Typical" dispersion was, IIRC, 1.1 M, 45", at 100 Yards range. That means that the bullets holed the target like a shot gun making any hit on a target less than 4/5ths inch in OD simple luck. Read the book Flying guns of WW-II.
To compound this, the wing guns are mounted far from the line of sight and the bullet stream is near it at only one range, usually about 180 M. That means that the pilot has to aim off from the line of sight to get hits at other ranges. A very messy problem shared by all planes with wing mounted guns to a greater or lesser extent.
Please, I am not trying to start a row, just explain why it was the way it was. For all of them, not just the Spitfire.
One thing that seems to distinguish the greatest aces from amongst aces in general was their mastery of deflection shooting. Pilots like Hartmann, Marseille, Johnson, Finucane, Malan, Tuck, Bong, McCampbell and Beurling were experts at it. Within this group the ability to use the least amount of ammo to down an enemy aircraft can be noted as a key aspect of what set one apart from the other. For me my vote on the Allied side would go to Beurling and on the Axis side Marseille. Both these guys, especially Beurling had hard evidence to prove they downed various enemy a/c with very minimal ammo often using deflection shooting (Beurling's preferred shot being to pump shells into the cockpit of the enemy a/c) as their main shot. For Marseille, his kills were all achieved against Western Allied a/c and pilots which I believe had better training and tactics than the Soviet pilots in 1942.
One thing that seems to distinguish the greatest aces from amongst aces in general was their mastery of deflection shooting.
AFAIR he (was forced) to used this tactic only for the Il-2 as it wasn't really easy to hit their weak spot (oil cooler) from longer range and their tree-top flying style. I doubt he could use it vs single engined fighters. I wouldn't call it downed - he crash landed multiple times because of debris damage and at least one time he was forced to bail out due to lack of fuel (chased by P-51s).Two of the pilots on your list admitted method of downing aircraft was " get so close you can't miss "
Both Bong and Hartmann were from that school of thought.
I think Hartmann was downed 7 or 8 times, every one from impacts with his victim's debris.
Hans-Joachim Marseilles was very good at this; in one engagement he shot down six P-40s with an average of two 20mm rounds and sixty 7.92mm rounds per plane.