That 300% is actually 300% of min day added ON TOP of what the trip pays. So 300 in most cases is or is close to 400. For example, a 2 hour turn at 300% premium would be 4 hours min day + 12 hours premium pay. Not bad for a turboprop.

Heard one guy got approved for 600 but I don't know if that is actually true or just pilot rumor. Also heard LH wants to get rid of the premium pay so enjoy it while it lasts!