I have some Buffalo Bore around the house and find their ammo lives up to its velocity claims, so I would think that 100-grain hardcast should do 1050 fps from your Bodyguard. Just for kicks, look at the velocities that the 9x19 115-grainers develop out of the new Kimber pocket pistol. You're looking at 1020 to 1050 fps. The Kimber pistol is a lot meatier and is designed for that kind of recoil impulse. The Bodyguard? My similar LCP?

I would look at what the Bodyguard was designed to shoot, and think, "Wow - that Buffalo Bore is neat, but it doesn't need to go in my gun." And that's what I've done vis-á-vis my LCP, especially since (as I've noted on many threads here and elsewhere) I've never worked on a shooting case in which regular .380 ball failed to properly penetrate (and the BB cast round is designed to maximize only penetration - which just doesn't seem to be an issue with standard .380 ball rounds).