the potential goes from 50 below the lowest to 50 above the highest, his being 760 is what makes it go up to 810 on the high side. Anyone lower than his 760 you match him with will have the potential to have up to 810. The highest mares will bring up the low end and tighten the spread (ie. if you had a 760 mare, it'd be 710 - 810)
Here's a tip create a Pinto.That is black.That will be a good base and can produce a lot of different colors instead of buck skin That's what I learned