Bore is a skill that lets your bullets pierce through enemies dealing bonus damage to subsequent enemies hit. It's description says
Each additional target takes +100% bullet damage
Does this mean the +100% is cumulative (+100% for the second target, +200% to the third target, etc) or is it just a flat double damage after the first? For that matter, is there a limit to how many targets a shot can pierce?
It also mentions this does not affect rockets and other special types of projectiles. What projectiles does it not affect?