I apologize is this has been posted before, but I couldn't find it in a search.
Most reloading data I see has a jacketed bullet and a lead bullet to see load data for. What do you do with plated and coated bullets?
For example, in 9mm I have quite a few different weights and styles of Berry's bullets I got in trade. Those are just copper plated.
I also got some 45 Colt Missouri Bullet Company bullets that are coated in Hi-Tek. Someone said that Hi-Tek coated bullets need 10-20 percent less powder. a) Is that true? b) 10-20% less than what?
Appreciate the clarification.