I mean if I were rear gunner, I would give an attacking aircraft a burst, even if I new he was out of range, just to let him know I got my eye on him.
So reduce the round life value to the effective range of the gun based on its muzzle velocity.
That way, ...the gunners fire, ...and you see tracers, ...but they don't hit outside lethal range.
The other thing is to reduce the rate of fire.
Flexible mounts with lightweight barrels are not stable, ...and the barrels flex.
Put them in an unstable, ...buffeting, ...possibly maneuvering aircraft...
Add to that a two(2) to three(3) hundred yard unstable maneuvering target...
A 1/3 rate of fire to represent accurate rounds (triple the % tracers to maintain visuals) is not unreasonable.
Waist gunners have mostly high angle rate shots, ...so reduce their range.
Tail gunners have more low angle rate shots, ...so increase their range.
Also, ...bullets slow down, ...so reduce the initial muzzle velocity by 1/3 (2/3 of spec.)
ie.
G4M2_Betty .dp
[GUNSTATIONS]
;; 1000ft ToF MV
; Type 92 7.7mm Machine Gun:
gunstation.0=1,51,1,0.300,635,0.258,0.01,164,1,60,1d1*3.2,0.00,0.00,6.424,0,0,0,-30,30,30,-30,1.2
; Type 99-1 20mm Cannon: Turret
gunstation.1=1,52,1,0.350,475,0.640,0.05,305,4,75,1d1*39.2,0.00,1.589,-2.200,0,0,0,-175,175,80,-5,13.8
; Type 99-1 20mm Cannon: (0.50xLethal Range)
gunstation.2=1,54,0,0.360,475,0.320,0.05,305,4,75,1d1*39.2,-0.877,0.225,-6.190,0,0,-90,-60,60,60,-60,13.8
; Type 99-1 20mm Cannon: (0.50xLethal Range)
gunstation.3=1,55,0,0.330,475,0.320,0.05,305,4,75,1d1*39.2,0.877,0.225,-6.190,0,0,90,-60,60,60,-60,13.8
; Type 99-1 20mm Cannon: (1.5xLethal/Engagement Range)
gunstation.4=1,57,0,0.340,475,0.960,0.05,458,4,75,1d1*39.2,0.00,0.001,-14.180,0,0,180,-30,30,45,-45,13.8
; Bomb Release:
gunstation.5=3,21,8,0.00,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
; Torpedo Release:
gunstation.6=5,62,32,0.00,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
[guns.0]
gun.0=680,0,0,0.800,0,0,1,680
[guns.1]
gun.0=500,0,-0.029,0.900,0,0,1,500
[guns.2]
gun.0=500,-0.923,-0.006,0.000,0,0,1,500
[guns.3]
gun.0=500,0.923,-0.006,0.000,0,0,1,500
[guns.4]
gun.0=500,0,0.001,-0.900,0,0,1,500
[guns.5]
gun.0=16,0,0,0,0,0,0,0
[guns.6]
gun.0=2,0,0,0,0,0,0,0
Not "dumbing down", ...but "smartening up"...
Enjoy.