I was curious and decided to see if Bullet effects stack and it seems that they all do except for Slicing Shot. Regardless if you have 1 or 3 Slicing Shot Bullets the number of Scar stacks will always be 5.

I also did a test with the Bullet combo of Slicing Shot, Spread Shot, and Double Shot thinking it would hit all enemies twice and give them Scar but it did not work. Only the primary target got Scar and got hit with the extra attack from Double Shot also Double Shot did not add an extra stack of Scar again it was at 5 stacks. I'm disappointed that it didn't work like I was hoping. Maybe other combinations might work but that one certainly didn't.

>>1687514
I didn't realize someone else beat me to explaining things I should have double checked my bad.