graves interaction with onhits such as..?

just the first one to hit, might be able to apply it to two different targets in one auto, as he can hit 2 targets, but only one on hit per target per shot for sure. if that makes sense.

From LoL wiki:

"BUCKSHOT: Pellets stop at the first enemy unit or structure they hit, meaning Graves is not guaranteed to hit his primary target. Each pellet will apply on-hit effects but enemies will only suffer on-hit effects once per Shell. Non-champion units hit by more than one pellet are Airborne icon knocked back."

"Additional Information:

On-hit effects, e.g. Blade of the Ruined King item.png Blade of the Ruined King, are applied once per attack to each enemy unit hit by a pellet. On-attack effects, e.g. Pix Pix and Runaan's Hurricane item.png Runaan's Hurricane, occur when Graves performs the attack regardless of his unique attack conditions. On-attack effects are applied automatically to the primary target, even if no pellets hit it. Sated Devourer causes each of Graves' pellets to apply on-hit effects twice. One-use on-hit effects are applied to the first pellet per shell to hit an enemy, e.g. Sheen item.png Sheen.

Critical strike empowered attacks will trigger on-crit effects on each pellet (e.g. Randuin's Omen item.png Randuin's Omen.)"

just once. yeah on hit graves can't even be played as a troll build. its that bad. same thing with jhin.