Have used 3031 in 223, 30-30, 308, 7mm-08, 7-30 Waters, and 350 Rem Mag.
In all of these 3031 is an okay powder. I think it is good in the 30-30, 7-30 waters case as it tends to be more efficient with that parent case. Perhaps it is just my perception too as 3031 has been the old standard in...