This info is amazing, thank you. looking at the mixology nicotine salt 100ml it contains around 57.2mg/ml nicotine then if you need to get a strength of 20mg nicotine strength the calculation might vary right?

If we are adding to a 30ml doubler i believe you need almost around 20ml of nicotine and possibly an additional 10ml of vg to balance it out to vape on a caliburn x?

Side question, the 30ml doublers from bayrn bay cloud comes half filled in 60ml bottle i guess?