To tell the truth I am not sure on the powder , my powder measure digital scale says 5.9 grns fills up the hull then i compress the bullet down on top to the second line on it an crimp , scale can be off as much as .4 gr too so I just rounded the number , I did make the mistake an will not do it again of hollowing out the base of 1 bullet as an experiment to make it like a mini ball (Dont do this ever) didnt have a catastrophic failure but did get gassed a bit from backpressure an was unhappy from the experience , the whole deal on the gun though was just to make it shoot again , I dont own anything that wont shoot or dont want to shoot it ,,t