Any one had any experance with throwing knives, if so what are good weights, length, style, steel and heat treatment ect.

Havn't made one but I bought one of Beaver Bills and he use's 5160 steel 1/4" its sorta my multi purpose tool thrower ,meat cleaver , chopper and it hold's a edge well

I would use a decent spring steel and differentially treat it, or quench it and put it in the oven longer than normal. But with the weight issue, just pick what suits you. i have found that for me, a knife thats heavy in the front with a straigh handle works good.

I make them for the local mountain man re-enactors - I use mild A36 steel and harden in Super Quench. They will bend and the edges get beat up but they never break and are easy to fix in the field with a file and a hammer. Start with 1/4"x1" flat bar and about 8-9" long. Forging a point will pull it out another inch or so. Handles are optional but should either be easy to replace or hard to break. I usually wrap mine in rawhide because that's what the customers think looks cool...

I make mine from farriers rasp. I anneal it, forge out the point, edge, and handle and glue/rivit leather over the hilt. I quench in motor oil. Its a little weighty, up to a pound, but I like the feel of the weight and it works fine for me, and like HWooldridge, mine bend but dont break.