Hmm it looks like most steel cutters are what they want you too use. Highest feed rates possible too it seems. They also suggest lower helix angle the better and a maximum of around 30 degrees. Arg I think I might have to buy a new bit just for this job, all my stuff is for normal aluminum and has a 45 degree or more helix. Well maybe it will be good to get a corner radius endmill anyhow.
Anyone confirm there experience working with it?