Broncofan...

I am not sure of the stocking rate, but if you are going to be feeding, it can be much higher. I don't think 400-500 would be too many. Another thing to consider is adding 50 pounds of tilapia to your pond every spring. They breed like crazy and your bass actually prefer them over CNB due to body shape. They will die off when the water gets below 50-60 degrees, so you will need to restock each spring.

Water dries, rocks crumble, and trees die. The only thing that is eternal is the reputation we leave behind.
- Ancient Viking Proverb