An FPB is a full-bore diameter, copper jacketed, hollow-based,conical that weighs 350 gr., made by Hornady.

It has a true jacket, not a wash application like a PowerBelt. No plastic gas seal, the hollow base is very pronounced and the skirt expands toobturate the bullet and get it into the rifling. The thicker jacket is supposed to prevent the fragementation problems that PowerBelts have when driven too fast.

They shoot well in my gun, though they did cost 18.50 for 15 at WalMart. I'll be watching the sale shelves after ML season.