I use a Colt Commander in .38 Super. I have Mecgar and Colt magazines but in the nine round type. Both work well. For factory ammo, I have shot American Eagle (Federal), Winchester (white box) and PMC ammo, all in the 130 grain hardball. I have also shot the Winchester 125 Silvertip round. The pistol has never jammed. As a lark, I once ran a box of .38 ACP ammo (from the Western Scounger) through it. It worked fine. The pistol remains box stock. I would like though better sights and a new trigger some day. As is, the trigger breaks at about six pounds with no creep.
This pistol is in the 1991-A1 series although it says merely "Commander" on the slide. I am told Colt produced several a few years ago. It was made to clear out some parts or the pistol is an overrun from a foreigh order. Anyway, it is put together well. There are no tool marks under the slide or anywhere use. The black phosphate finish is thick and evenly applied.
Eventually, I plan to do some re-loading for this round. I would like to try a 147 grain bullet at around 1150 fps for plinking and hunting. For self-defense, the factory silvertip remains the first choice. Any bullet in the 9mm class works in this round. A 95 grain bullet at 1300 fps would be interesting too, although I am told such a load won't make the steel plates fall in competition. Finally, the pistol usually does produced a little fire puff from the muzzle when using factory ammo, except for the .38 ACP, of course.
The .38 Super is the most under-rated and under-appreciated cartridge now. It deserves much more attention.