Flyrobb, most of the manufacturers of plated bullets offer TP (thick plate) or HP (heavy plate-don't confuse with hollow point:P). These heavier plated bullets are supposed to stand up to being pushed harder. It also seems like I read somewhere that the Speer TMJ is a heavy plated bullet. I suppose the reason for pushing them harder is to mimic a SD loading for cheap practice.

__________________
Trucks and guns.