Try 4 grains of Red Dot for a target load. 5 grains will give you a plinker with a little more oomph.
Boy, those would be plinker loads
. The tests I ran were from 6.5g, 7.0g, 7.5g, and 8.0g under 240g SWC which I thought were 'light'
. Again, at work so the chrono data isn't available to post up right now.
Never have seen any Promo powder in any store I've been in.