Long, long ago, in an issue of Primitive Archer far, far away....
There was a guy that wrote an article about casting tool steel replicas from original knapped stone heads. They were heavy as boat anchors, but if you like high F.O.C. arrows, how wonderful is that? Still, the cast metal edges cannot replicate what the fractured stone edges do.
Keep knapping whatever you can get your hands on, even if it is only a stale soda cracker! Consider it homework, paying your dues, or earning your keep. When your points are good enough, the deer is not going to refuse to die because it was toilet tank ceramic and not aboriginally mined Glass Buttes obsidian!
And don't forget to post pics for those of us that can't read.