In real life 45?most certainly is not the best angle for max range. First of all air density isn't constant during the path of flight. A ballistic projectile in this case easily reaches heights of 15+ km at it's peak. Furthermore firing beyond the horizon means you're actually firing around the earth curvature. To calculate max range angle you'd have to calculate a very complex differential equation.
I'd guess the real best range angle is around 40?maybe. Might even be lower. But it doesn't really matter. During WW2 no nation had the technical capabilities to see if they hit the target. Quite frankly land artillery is more precise at max range, because land artillery usually includes recon ops, that help correcting targetting offsets.
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