Interesting thread. I've shot more .38 Super than any other caliber, except perhaps .45 ACP, numbering in the many tens of thousands of rounds. When Major really was major in IPSC (175 PF) I was running 124 grain bullets at 1425 fps (my favorite and the one I shot most), 115 grainers at 1600 (only briefly--stretched barrel links were a problem) 135s at 1335 and 150s at 1200. All these velocities are from a 5" barrel, using SR-4756 powder. No, you cannot do that with .38 Special without getting way out into +P+ Land. NO, you won't find manuals with those loads in them, at least not for the light bullets. That said, factory .38 Super loads, except for some Cor-Bon and Double Tap loads, are pretty wimpy, and I wouldn't worry much about shooting them in a .38 Special rated for +P. Super cases are much stronger than Specials, which also helps, and bullet diameter is .356", which will reduce pressure a bit in a .357" tube. Nonetheless, I can't see a good reason, other than just not being able to get .38 Special ammo, to use Super ammo in a Special.