In article ,
"Yann D" writes:
btw, I have often read that japanese pilots were unhappy with the MG/cannon
(A6M, J2M) firing with different ballistic behaviour, but never heard about
Spit pilots complaints except about the early Hispano jamming and recoil
shake.
Any hints ?

The Japanese 20mm cannon used on the A6ms was a low velocity weapon
with a fairly poor ballistic coefficient. (So lots of drop). The
20mm Hispano used by the Brits as a high velocity weapon with a better
shell design, and it matched fairly well with the trajectory of teh
Browning .30 and .50 guns over teh ranges normally encountered in
combat.

--
Pete Stickney
A strong conviction that something must be done is the parent of many
bad measures. -- Daniel Webster