As far as I know the plated and coated bullets are good with the fast, hot powders. The plain lead bullets melt much quicker. Are you shooting 9mm or 45acp?
The SNS coated bullets that I am getting are for 9mm. 124 gr. I certainly have not seem a problem with the plated Extreem bullets and I have picked up many shot rounds from my "test" area.All's Ive shot in 9mm in the last 10 yrs has been cast mostly with titegroup, never an issue with leading from melting the back of the bullet. But I dont run max loads either