How many times do you need to kill an iron dragon to get a draconic visage in runescape?

There is no set number of how many times you need to kill an iron dragon to obtain a draconic visage. Some people can obtain a visage within 100 kills and a lucky few even their first however around 99% of people find trying to obtain a visage very hard as the drop rate is estimated from 1/2500 all the way to 1/15000! I myself have killed around 10,5k Dragons in total and around 1,200 of those kills being the King Black Dragon. I have failed to obtain a visage so far. Good Luck and don't give up hope!