What Hooligan Said

Ballistically it is very possible to hit and seriously damage non-manuevering targets at 1,000 yards with weapons such as .50's MG's and 20mm Cannons in real life.
Just look at the ballistic numbers. Hell, a .22 caliber rimfire cartridge is reportedly lethal up to over a mile, which is 1760 yards, and you expect a 20mm cannon at 2/3rds of that range to not hurt you?
In Warbirds, there was no dispersion at that time, and people were scoring kills at those ranges against manuvering targets. Quite a different situation. And we won't even go into the issue that the shells in WB's were the size of "beach balls".
And even then the arguement was that "in real life" pilots didn't score kills like that. Well, this isn't real life, our sim pilots have a life times worth of gunnery experience compared to WWII pilots, plus we have instant radar ranging with the icon system that is in use in the arena.
Even with that arguement, pilot accounts of scoring kills at that range are documented in both after action reports and in gun camera footage that is commercially available today.
Its just that kills at that range were not common in real life. And they are not common in AH.
So yes, if in your tests your "target fighter" is flying straight and level, your on his direct six, and you fire enough ammunition to overcome dispersion and bad aim, you should be able to easily shoot him down. Especially with 20mm cannons since most of their lethality comes from the explosive force of the shell which is consistent no matter the range, unlike the kinetic energy which disapates the farther downrange you go.
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Vermillion
**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"