Not being insulting or offensive, but why would you use cheap bullets in a premimum revolver with a newer "high tech." cartridge?

This thread is one of the reasons I don't recommend plated bullets to new reloaders; not enough easily found info. As for increasing the crimp, on a plated bullet in a heavy recoiling gun it will be pretty much trial and error. Add more crimp until pulled bullets show damage and plating cutting. Shoot a few and check following chambered rounds for "walking" bullets.

I'd suggest some regular jacketed or even cast lead bullets to start with and shopping around you can find some good prices...