They're very very accurate.
Yeah when I was f2p I saw folks in complete rune tanking the level 50 spiders on RuneScape gold the 3rd level of stronghold with bronze arrows. That might work. I also know that the people with very large variety exp in f2p failed ice giants for at least a great deal of their exp. So maybe those would work also. Smart thought to tank using bronze arrows. :-LRB- Truly... just go with full green...