This ticket only scratches the surface of whats wrong with the helo flight model. With how bad it is, I'm assuming they know, and it will be fixxed at some point.

Alpha. Alpha alpha alpha, alpha alpha, alpha alpha alpha alpha. Alpha, alpha alpha, alpha alpha.

I'm not entirely sure how the SDAR is supposed to work as it's modeled after a standard (not underwater) rifle, but the APS (the old Russian underwater rifle) was smooth bore, and the rounds where stabilized by hydrodynamic effects. However given that the APS fires giant bolts, and the SDAR has a normal sized magazine, I assume it operates on different principles.

I'm guessing it's more likely that it is supposed to operate similar to the new ADS rifle/round that the Russians are making.

Either way the bullet shouldn't disappear.

There is an issue in that the bullets DISAPPEAR. They aren't just super inaccurate as they should be, they just disappear. And up until that ~45m it's still relatively accurate, which it shouldn't be.