"Cotton tail 215" wrote in message
...
why fire a cannon at a figther ,you needed power to kill a big bomber..a
..50mm
would shredd a zero so why would a P-38 jockey waste 20mm on one

Because he could

a) Shred it faster
b) Also take on a tougher opponent like a Bomber or FW-190
in the ETO
c) Do more damage when strafing ground targets

Keith