My .44 Handi (now .445 Super) is on a SB2 frame. It's an older overbored barrel, but, it always shot Hornady LEs very well. Now that I'm reloading, I'm not shooting them very often. I think they'd be safe on a SB1 frame, but Tim or someone will come along and verify that. I wish they gave us the option of paying extra for SB2 frames; then you'd be good to go with any rifle barrel they make. I finally have all my rifles on their own SB2 frames.
Pete