To my knowledge the original spec was a 130 fmj at 1300. I have never found any major manufacturer's ammo that actually got that (some is as low as the mid 1100s).
Ken Hackathorn once found a lot of Remington that he shot which did clock just over 1300 but he found that noteworthy enough to mention it.
Silvertips usually hit about 1225 in most of my Supers. I have some Cor-Bon but have not clocked it...they usually live up to their claims though (right now, not being home, I forget what that is).
The Super .38 has potential but it sure isn't much of an improvement on the 9X19 in factory form except by some of the specialty manufacturers.
Way back when, before it was "discovered", I used to shoot cast 160gr bullets at about 1270fps...that had potential but of course they would not expand. Allegedly you can hit almost 1300 with a 147 using Nobel SP2 and still stay under max SAAMI pressure but I do not know...I have used it to reach right at 1400fps with a 147 in the 9X23 though.
The 9X23 is the round that the Super whould be. It is surprisingly easy to make one but you cannot do it with the old Colt Barrel.