Question about Echoing Shot (Amp Bot+)

• Echoing Shot: Tower Bullets within Range count as {0} bullets. Ultimate Weapon projectiles are also boosted, but by 1/3.

this is what the patch notes say. What exactly are UW projectiles? Just SM? is CL considered a projectile? are ILM? i guess PS/BH ticks are not projectiles.

would that mean if i have 3 extra projectiles, that if i hit with a SM, it counts as 2 hits? will it apply double the SM amplifier?