When I was using the Super, I usually used a Speer 125 JSP with a stiff load of HS-7, for messing around in the woods. That was at least 30 years ago, and I'm sure there are better powders available now. That Speer bullet was pretty soft, and would expand easily even in 9mm, so there might have been better choices, but it was available and inexpensive.
Mostly, though, I shot cast 125s on top of 5.5gr. Unique. I cast my own (LEE 356-1252R mould), and it was a hummer of a bullet, and again, it was useful in 9mm, too. I can't count how many of those I shot, but it was a bunch. That load was basically a 9mm equivalent load, but shot better in that Super than most of the 9s I've had. I had scads of enjoyment shooting it. I suspect you would, too.
