I know their not supposed to be on large mice! I am the new owner and am also aware of what size to feed my snakes lol I have done my research. However, just trying to see the best way to get a ball python to switch from live and frozen thawed mouse to f/t rat all together in the safest way, which is why I threw the body weight in there. Was trying to figure out if switching 450g snakes is an ok body weight to make the switch or wait a little longer?