Thanks HR, I guess it was on my list of lookups to do... from their description...

"These bullets are a thick plate and the hollow base adds length to the bullet profile giving more bearing surface. Added bearing surface helps with accuracy in pistol barrels. Thicker plating lets you push these bullets to 1450fps in open guns in calibers like .38 Super"

This does generate a couple questions, but they don't mention modifying current load data recommendations to achieve the new normal, but the velocity does imply more powder, as does the increased bearing surface. I notice some books list Gold Dot with different loads than other same weight jacketed bullets and then again some books lump the TMC Gold Dots the same as std Jacket load data. So is a thick plate TMJ loaded the same as jacketed or not? Some say yes, others no. I sometimes wonder if they publish different data just to have more listings in their book.
Is Berry's moving into that category with these?