In a nutshell: Its not the size, its how you
use it.
Last night, i killed a Spit in a 1-pass-high-deflection shot with 8 x 303s, easily took his wing off. A F4U-1C had unsuccessfully tried to kill him, hit him multiple times but didnt take off vital parts (He got the kill later). With that i dont want to say the C-Hog was a bad shot... i just was lucky hitting at the right place, at the right time,
in convergence range - thus concentrating all my bullets in th same place.