I'm not entirely sure if that's true, because if it was then why the hell didn't they make ostwinds have far higher chance to hit aircraft? Right now the ostwind is pretty mediocre in terms of AA, which makes axis AA pretty mediocre. Yes OKW have the schwer and it's "free fuck-off cannon" but that's horribly inconsistant. Personally I hate that big free cannon, but the faction needs some design changes.
Essentially: If it is dependant on bullet size and not just RoF, we're either missing a factor that hampered the balance team when the AA changes went through or they really messed up on balancing that.
As far as I remember the teachings of cruzzi, there are 4 factors that affect performance of AA gun:
1. The probability to shoot down with a bullet (0 for bofors)
2. The RoF
3. The range of AA weapon - different from the range against ground targets
4. The turning speed of the weapon.
All of them affect the performance pretty significantly and they also determine the way a gun should be used. For example quickly turning MGs can be used right where the plane is, but guns with more range and less turning speed should be positioned further from the planes or they will just rotate not able to track target and thus not fire at full potential.
I think the ballance reasoning for ostwind performance is simply that ostheer right now has the most sources of non-specialised AA. The popularity of 222s and tanks with pintle is so high that buffing ostwind AA could actually upset the ballance in the skies.
Tbh though, I think this thread is about the M5
