I load 79 gr. of Swiss 1-1/2 in my .45/90 below a 480 gr. bullet. My Uniflow powder measure drops it then I weigh it on my 505 scale. I just started a new lot of powder and my powder measure threw 82 grains so I cut the measure back 3 grains. I am assuming to maintain my same load I need to be more concerned about weight than volume