I know them by reputation only, but yes, the BB FBI load is as good as anyone's, if not better. FWIW, if you're thinking about running heavier bullets because of heavy clothing, I wouldn't bother. When I tested ammo in Perma-Gel, I found that heavy cloth oftentimes causes bullets to penetrate further. IME clothing does very little to slow down a bullet. Instead it may modify their behavior by retarding or preventing expansion. If they shoot to POA, Corbon DPX would be your best bet for positive expansion and consistent performance, but I just don't see Speer SB not working well either. I would run with those if they're working well for you.