Hey guys, if you were going to only buy one powder for 16ga 1oz clays and field loads, which powder would you buy?

Probably going to use Remmy high brass black hulls, bpi wads, and currently available cheddite 209's. #8 shot for clays, #5 for field.

Not looking for high velocity, all my 16ga guns are 80-100 years old.

Thanks!