+1 on the comments regarding case neck tension being the key factor in bullet retention. When loading .45 Colt, I have dealt with the lack of a cannelure (which is typically associated with plated bullets) by backing off the normal roll crimp until it's just enough to straighten the case back against the bullet, or maybe slightly more, making a very light indentation ring on the bullet. Manufacturer's like Berry's and Rainier say that mild crimping is ok, but the bullet plating is quite thin (too thin for a cannelure, that's why it's not there) and you don't want to tear it with the crimp. I then measure the reloaded cartridge in a .45 Colt case gauge to make sure the case mouth is within standard specifications.
Shooting the rounds assembled as described have produced no suprises. Accuracy of these plated bullets in my .45 Colt revolvers (Anaconda, 25-5, Blackhawk) is so-so. I'm not a big fan of these plated bullets, but they are priced right if you feel like taking a break from scraping lead out of your guns.