Use a SWAGED 240 gr. HP SWC like a Hornady. You won't be driving it fast enough to lead up your barrel, it will obturate at these lower pressures for better accuracy and they will expand at these lower velocities. Read up on 38+p LSWCHP and you will understand my reasoning.
I believed that myself until I used and tested the 240 grain lead HP mentioned. Hornady used to make a 44 Mag factory load with that bullet rated at 1000 fps. Expansion was minimal, just a small belling of the nose, when fired from a 4" Model 29 into wet paper or water jugs. I even bought some to handload and it took north of 1100 fps for the to expand, blow the ring off and send the shank on as a wadcutter. By then they were leading to beat hell and I eventually gave up on them.
IMO the XTP is the best thing to happen to conventional handgun ammo in a long time. I've handloaded them in the 357, 44 Mag, 45 ACP and 45 Colt. If you are in the velocity range for an XTP, you are going to get some expansion. Bullet integrity at high speed is just as good as Gold Dots. And XTP's have produced some of the finest accuracy I've seen from jacketed handgun loads.