For fully functional .45 ACP loads, only a real taper crimp worked for me. Tried in vain to get the "modified" taper crimper die of my Lee set to work for me with cast bullets. Just couldn't make it work. A Hornady taper crimp die solved the last of my problems.
What you want is the minimal amount of crimping that will allow flawless functioning. If you have a caliper, measure the case mouth of your cartridge. Compare it to a factory load. It might be a few thousandths larger. You can crimp it to the same diameter as the factory load, or you can let your pistol decide for you.
Take the barrel out of your gun and use it like a cartridge gauge. Drop in a factory round and listen for the light metalic "click" it makes when the mouth hits headspace. You want to make your cartridges do the same "click". Place one of you cartridges into the shellholder and run the ram up to its maximum height. Start screwing down your crimping die untill you start of feel resistance. Lower the ram slightly and screw the die in slightly more. Now, run the ram up again and start crimping. Take your cartridge out, measure it with the caliper, then drop it into the chamber. Just keep on making incremental adjustments to the die till you get the level of crimping that just allows the cartridge to drop into the chamber. Write down that number, lock down the ring, and crimp away. You're done!