The only dumb question is the one that is not asked!
The measurement is a volume measurement. What I did and I had to ask also,
was to get a good brass powder measure and some of the clear plastic or green or red or yellow powder holders, load my rifle with the powder charge I selected and then take 4 or 5 of the plastic containers and put your measured charge in it and off you go. I always have my measure and extra powder in the truck, well a fellow can hope to get that many shots. I use the blackhorn powder with a standard shotgun primer. (no crud ring) and for me tighter groups. Good luck