I fly with 4x Red tracer Ball ammo on the 2 most outer guns ( reminds me of the P-51 in 1946) and 2x Ap and 2x DeWilde on the 4 inner guns. With the convergence setting and the wingspan of your targets the damage is horrific:
Wingspan of the targets for your gunsights:
Bf 109 32 ft
Bf 110 53 ft
Do 17 59 ft
Ju 87 45 ft
Ju 88 60 ft (a-1 version)
He 111 74 ft
BR. 20 70 ft
With the correct convergence one can easily concentrate on ripping of the wings of bombers
.