Lee Juras of SuperVel fame made a name for himself and his company by loading slightly undersized bullets into cartridges and pumping up the volume so that his significantly higher velocities didn't result in significantly higher pressures. The results worked pretty well. Well, years ago when I was hand loading I took a page from his book and started loading 9mm bullets (0.355") into .38 and .357 (0.357") rounds. I used Sierra JHP bullets. The result was a pretty hot round that worked well and didn't exhibit any symptoms of high pressures, and would shoot into the black from both my 4" and 2" revolvers with no problem. I'm sure I'll draw critics, but it might be something for those of you who are still rolling your own to consider.