Just wanted to check on this, as i cant find anything for or against, but i suspect its fine.
But a leman russ arriving from strategic reserve, and not moving more than 5" onto the battlefield (can squeeze in either sideways, or just enough if equipped with front mounted h.bolter/h.flamer) cant still fire twice with its turret weapon using the Grinding Advance ability?
If this model Remains Stationary or moves under half speed in its Movement phase (i.e. it moves a distance in inches less than half of its current Move characteristic) it can shoot its turret weapon twice in the following Shooting phase (the turret weapon must target the same unit both times). The following weapons are turret weapons: battle cannon; eradicator nova cannon; exterminator autocannon; vanquisher battle cannon; demolisher cannon; executioner plasma cannon; punisher gatling cannon.