When I first bought my BP, I tried to feed it outside the vivarium live and f/t but it really stressed it out. One time the mouse was actually trying to get out climbing on my snakes head. After reading on here and watching snakebytes tv on ---> You tube. I realized it would be better if I fed it inside it's vivarium. And wow what a difference, but it eats only live and I'm going with it. I'm tired of trying to get it to take something it seems to hate, (f/t) My wife wants me to go with live, my snake does, so why not. It loves to strike inside or just outside it's hide, ( mostly inside ) lately it has been as soon as the feeder sticks it's head in the door. I can tell when it is hungry now when I see it's head waiting just inside the door of the hide. I just went from large mouse to small rat and it is working perfectly. My snake is very skilled at quickly dispatching it's prey. And so far not a mark on it. But I think it is important to go with the appropriate sized feeder. Never too large. I would rather feed it 2 mice, then one too large a rat. Sometimes I think, if they could, the snakes would would go out somewhere and bring in some road kill and say here eat it.
Actually I think they eat what they are use to eating from the start. Live or F/T People can switch it (sometimes) if you want, but I'm not.