3-4 speed loaders normally is what I carry daily and I would plan and allow for about 400-500 grains of powder per day and carry that in a sealing container. Same for caps or primers carry plenty of extras in a dry container.

Basically, you need to figure what your hunting load is in grains, multiply that by however many speedloaders you will carry and then multiply that by how many days you will be hunting.

Just an approximate. I have never used up all the powder unless I loaned some to replace someone elses powder that either got wet or they ran out early.

Tahquamenon