Thread: Powder for 303 150's

For what its worth I suspect 2206h will prove to be too slow with cast bullets which don't develop the pressure needed for clean burning and leave unburnt powder in the bore which can affect accuracy and consistency.
I use imr 4227 or adi 2205 in cast bullet loads and am very happy with the results. Then there is always the tried and true 10 grains of unique or blue dot that seems to work with everything if you want jut around the speed of sound.