I've seen a couple people do this, but I've never gotten 99 range and don't plan on it any time soon, but This seems like it makes sense, full void, red chins, full invi of prayer pots/super restores, 2 rocktails, and a tele tab, and just goto mummies in Chaos tunnels and protect from melee, and just run around to get all their attention and then get in a corner and Chinn them to death.
and my friend said he got from 80 to 99 in 34k red chins.