10% body weight is the starting point with 15% being the higher end.
so 39 grams upto 58.5 grams.
if you are feeding on a 7 day I'd lean to the heavy side for sure, on a 5 unless the snake is building eggs or recovering some weight then maybe the lower end to middle.
I just wanted to say thank everyone for your help. I fed my 390g ball first weaner rat it was 31g and the Snake didn't waste any time as soon I drop the rat in the tub BAM the snake got it.