Anyone have any experience with this stuff? I'm told its 36-40 rockwell. I have to mill 48 .260 wide slots about an inch and a half long in this stuff. The stock is .225 thick. I'll definitely be using carbide mills and drills for pilot holes... Any help with feeds speeds, doc, chipload, sfpm etc... This will be done on a haas VF3, 7500 rpm max spindle speed. I figure i'll start about 130 sfpm maybe .100 DOC? (nuts).