Best bang for the buck will be lead, coated, plated over fast powder. I very much enjoy 200gr slugs over 5 to 6gr of Hodgdon Clays. Very economical and this powder doesn't leave much to clean up. I would go so far as to say cleaning the gun after 50 to 100 rounds is waste of time.
I loaded 4.2 grains of Clays with a 200 gr coated HBWC. I would probably use slightly more next go round.
I have also loaded the same head with 5.1 grains of Winchester 231. HP 38 would work as well. It's the same powder.