I must say, that from my FE (shooter) I've hit (but not kill) planes at a max of 1.1k with just about every gun at one point or another. It generally doesn't matter what the other guy is doing -- if he pulls G they are going to get caught, and if they don't, a bit of fire-and-correct with a bit of spraying works most of the time, regarless if they are flying straight or rolling, etc. just leading on more then one plane of motion.
The only guns that I haven't been able to hit that far with are the Mk 108, MG 151, and the ShVaks (and the 38's M2 20mm), as a function of ammunition duration.