So far, I've noticed that 128mm nuclear cannon shells seem to land well past what you're aiming at, while nuclear sniper rifle rounds and rockets seem to detonate sooner than expected. I'm not sure if this is something up with Warheads or Schall Tank Platoon, as I haven't tested the full range of nuclear weapons yet... but even the standard 20t nuclear rocket that replaces the basic atomic bomb seems to be affected.
Sniper rounds and rockets detonate about 10 meters short of their target when firing from max target range, which for low yields often means they end up doing only superficial damage unless you get much closer before you shoot. Meanwhile, larger cannon rounds appear to detonate almost a full screen past the target no matter where you actually aim (even when manually firing with the C key).
Sniper rifle example shots:
128mm cannon example:
For the tank in particular, I even tried force-firing directly in front of me, but the rounds always seem to travel the same distance, like they aren't respecting the target you specify. I suspect the same is happening with the rockets, as firing them up close (within self-eradication range) is accurate, but putting them in a rocket turret that starts tracking enemies at long range results in them prematurely detonating.
Any ideas on what could be wrong? Could something be up with the per-projectile range modifier? It's possible it's just something on my end, so I wanted to see if you'd run into this at all!