I understand this isn't what you asked for, but in the interest of 'general knowledge' for reduced loads, I suggest you take a look at Trail Boss.

http://www.hodgdon.com/PDF/Trail-Boss-data.pdf

I've used this for some reduced .308 loads for a 11 year old and it works great. Did a 'ladder' of loads and picked the one that shot best in the rifle. He's gone through nearly 50 rounds so far and loves shooting it!! I've got 50 more ready to go for him.