We aren't trying to get you frustrated or confused. We are just telling you what has consistently worked for us. When I got my first BP, on feeding day I would go to the pet store and ask for a feeder mouse and they would always give me a little hopper mouse. Once I found out that it was better to keep track of my snakes weight and feed according to weight for at least the first year I went and bought a digital food scale and I've been taking it to the pet store to weigh my feeders ever since. The first time I bought a mouse that was 15% of my snakes weight and saw the size difference, I figured there was absolutely no way he was going to get it down. I figured wrong.
He got it down quite easily, and after a few feedings like that, he had a growth spurt and started putting on weight, size, and length.