An adult male doesn't need multiple jumbo mice. Good lord..

Try for 2-3 medium to large adults(2 if large adults, 3 if medium adults, I mean mice, not snakes).

If the snake doesn't want rats, it doesn't want rats. Who cares. They grow just the same on either and you can vary the amount of food they get each week if you're feeding mice. Keeps them on their toes, so to speak.

My adult females generally get between 3-5 adult mice. These weigh about 20-25g. That's equal to a large small or a medium rat. The adult males get 2-3 mice, depending on how big they are(the snake). Yearlings get 2-4, also depending on how big they are.

I have girls who are 6+ years old eating mice. They're quite content and chunky