I have two BP's that are almost half that size and they each ate a hopper mouse and a BCI thats about 200 grams that ate a large mouse both with no problem and left a slight lump in each but all could have had slightly larger.

I would think the largest mouse (lrg-xl) you can find or a weaned Rat would work maybe try a rat pup first, thats what Im going with next for the BCI and an adult sm mouse for the BP's or a rat pup.