Remember that loading a WC bullet flush is going to almost cut your powder capacity in the case by 1/2. If you load something like a 200 grain wadcutter flush and use a charge intended for that same weight in a normal SWC bullet, you're going to get a very serious pressure spike.
I'd just look for a standard SWC with minimal taper, and you will have, for all practical purposes, a wad cutter.
I cast and shot thousands of wadcutters in .38, and found that the loads weren't any more accurate, and I just didn't like them anyway. wimpy dirty loads.