I guess you haven't witnessed a PowerlessBelt failure yet. If you keep using them, trust me you will. I would also like to see more weight options, and I'm sure we will. If their ad is accurate, these bullets can be pushed at MAGNUM (not for me) velocities, try anything even close to that with a PB and you will be sorry. After shooting PB's into several types of media, I have everything from disintegration to bullets that look like you could put a new skirt on and shoot again. I have also witnessed my buddy shoot a big 6x6 bull elk at 28 yards, in the same place I had shot one, the bullet failed to penetrate into the boiler room. The difference was he was using 110 grains of Pyrodex RS and a 295 grain PB aero tip, I was using 80 grains of 777 FFFG and a 430 grain lead conical. Mine went 56 yards, we tracked his for over 3/4 mile and looked beyond last blood for two days, just got sick. No game animal deserves that.
70 - 80 grains powder with a PB should be a max load, anything above that can be explosive. I tried to warn my buddy, but his loads were working on whitetail, so he thought they would work on elk too. The shoulder on an elk has about 4 to 5 times the mass of a whitetail, and they are tough buggers. I wont even give the PB's I have left over (about 50 or so) away, because I don't want to be responsible for somebody thinking they can hotrod these bullets and wound game. The only thing I would shoot with a PB is a coyote!
I think the FPB stands for "Forget Powerless Belts".