to reload sks30, you need to open the magazine trapdoor manually and load a 10 rounds en-block clip like PTRS. The complexity of the loading action was also one of the reasons why the SKS30 was eliminated
But game’s reloading animation of SKS30 operates as Garand. The empty clip ejected from the ejection port, and new clip loaded into the magazine from the ejection port

↑en-block clip SKS30, There is no slot on the side for fixing like Garand M1
And it has the release latch of the magazine trapdoor. Just like PTRS. I believe that SKS30 should reloading as the PTRS
Inflrmation from kalashnikov official site