I just started reloading .44 mag using lee classic turret press with the auto disk powder measure. I'm using the 1.36 disc which is supposed to give me 18.3 grams of powder. I loaded 6 bullets and checked the powder that was dispensed in each one with my scale , and they were all different ranging from 18.3 to 17.5. When I reload 9mm I check it periodically and it's always at 4.3 grams every time. Just wondering why it's different every time with the .44mag shells. Any thoughts? Thanks for the help!