Last night I was reloading some 230FMJ 45 bullets with PP. I dumped the powder in my measure to notice the powder was dark on the bottom and very light colored at the top. I figured it was just the way I saw it through the measure. As I was chrging cases the first 15 came out the light color and measured at 6.4. When the darker stuff started to come out the same volume weighed a bit more. I know there is no way I mixed powders up. I only have the canister of powder on the bench that I 'm using and the rest is in a cabinet seperate from my bench. The powder looked the same just some was light grey and most was a lot darker. Last time I loaded for my 40 ( maybe a few weeks ago) I didn't notice anything like this. What gives?