lee_terry's page

It does not because if it did that would make taking Slipslinger Style feat (which lets you treat any weapon with sling in its name as a sling) pointless. That being said Slipslinger Style is in a way better sense for about the same price you get the same result with an additional +2 attack bonus (+1 from wep prof and +1 from Slipslinger Style). I said about the same price because you need to have taken the Warslinger racial trait to get it (so 2 feats and 1 racial trait). That being said it makes any skill/feat that uses a sling work with the sling staff and the racial trait required to take it replaces Sure Footed which is 1 of the least useful racial traits imo (so you are not missing much). I personally would have preferred to use ammo drop + juggle load because I originally wanted to take Secretive Survivor as my racial trait to replace sure-footed but the GM I play with won't allow them to work with sling staff.

It's not much different from a revolver pistol and I have been told it does not work on them. I was told that once the container becomes attached it becomes part of the gun and would break the enchantment because the enchantment cant be used on part of the weapon. The enchantment you need for what you are after is Reloading Hands because it will do exactly what you want and it can be enchanted to a weapon. That being said regardless what the rules suggest the decision ultimately falls on the DM.