It appears reloading a weapon from empty of a tactical reload (before using all of the ammo in the current magazine) uses the same reload animation. The weapon appears to have a reciprocating charging handle. When empty, it does appear to have a bolt hold open feature. Yet the reload animation does not acknowledge this. Upon initiating the reload, the charging handle magically appears in the forward or battery position, and then seems to "charge" itself (moves back and returns). The correct animation from empty should be the charging handle and bolt remains open (to the rear), the character removes the old magazine and loads a new magazine, and the bolt is released via the bolt stop/release so it should then snap forward into battery.
A tactical reload before the weapon is empty should be as simple as removing the old magazine and loading a new magazine. The animation of the charging handle going back and forth should not happen while reloading with a round still in the chamber. Also on that note, the round in the chamber is not acknowledged in the ammo counter.