Here is what Hodgdon says about their choice of H4895 in their youth loads:
"For all cartridges we chose H4895 because it is the slowest burning propellent that ignites uniformly at reduced charges."
May be just me, but if I were wanting reduced loads for one of my children, I would have a strong bias toward pressure-tested data developed by one of the powder manufacturers.
And based on what JPro posted above and the calculation I ran, the reduced load in the .308 ought to recoil about like a full-bore load of a 100 gr bullet in a .243. That really ought to be manageable.
