I made my first shot pouch out of Elk hide, with the rough side out, but made it too big. If you fill it, it weighs about 3 lbs.!! I have an Irish scoop-type head on it, and it works fine. Just don't relay on the measure on the scoop, as it throws shorter and shorter amounts of shot as the shot size goes up. I have have an antique power dipper which is far more accurate. So I use the scoop to get the shot out of the pouch, but then pour it into my dipper measure( I know men who have made fixed measures out of antlers, horn, and wood) to make sure I get the load I patterned before the hunt. It takes a little more time, but I am not in a hurry hunting with my BP firearms. If I am in a hurry, I take the modern butt stuffers.
I carry that bag in my hunting pocket, the powder in my horn, and the rest in my possibles bag.
For my new Fowler, I was given an expensive bag with the Irish shot pouch that is sewn into the strap. It holds more than enough shot for a hunt, but the scoop has the same problem, and I still pour from the scoop into my dipper, and then into the gun. When someone complains how long it takes me to reload my gun in the field, I ask him how long it takes him to reload his cartridges by taking them home, and running them through his reloading press, and driving back out? They actually smile at that one! If hunting is only about killing birds, or game, most of us would not do it. Those quiet times between shots, when we are reloading our guns, or cleaning them, is the opportunity to stand still, feel and smell the wind and air, really see the terrain we are hunting, and enjoy the moments of the flush, the rise, the shot, and the recovery of the bird. I don't apologize for making my hunting companions stop and enjoy just BEING THERE.