The steelhead basic cases never caught on with shooters and they are a collectors item today. O’Connor was also a rifle maker and moved around a lot. Where he is today I have no idea and he may be retired by now.
There is nothing inherently wrong with the idea of the steelhead cases. Shooters have experimented with them in high intensity cartridges for years. Following WW II when surplus steel '06 cases became available there were a slew of cases using the steel head with a brass front, all made like O’Connor’s.
The danger with them is that there are always a few shooters who will use them to try and push otherwise safe and sane handloads to new heights. O’Connor said he tested his cases to 140,000 psi. That exceeds the strength of most rifles by a good margin. He never recommended that they be loaded to such levels but the figure of 100,000 psi is common when talking about his cases. From a shooters perspective I cannot imagine why anyone would want to put his eyes behind a rifle/cartridge combination generating 100,000 psi but I’m just a girly-man when it comes to anything that might damage my pretty-boy face.
I liken a steelhead to my automobile. The speedomoter goes up to 160 mph but I have never driven anywhere near the red line. But there are drivers who will. They are probably the same guys who will load a 30-06 to 100,00 psi.