Making a horn is half the fun of carrying it. My favorite for hunting elk is a small one that will hold only 700 grains of Swiss 2f. I have scratched, notice the word 'scrimshaw' wasn't used, a crude map of my favorite hunting area on it, complete with red 'x' at kill sites .When hunting, we need to keep weight to a minimum, and there is no need to carry a full pound of powder, 700 grains is enough for more shots on big game that anyone would need. For range use, or small game use, a larger horn would be needed. The horns I have put together totaled about 2 hours of time each, just puttering around. Give it a try- just give up a little of television time.
My next horn project is to build a horn for my wife from a buffalo she killed. It will take more time, as it will need filing and sanding to spiff it up. The shape won't be the best, but when she uses it, she will be remembering her buff.