Long, long ago, in 1965, when I was about 11, an old timer once told me that the little horns that some considered "Priming horns" were nothing but horns that men took out with them on day hunts. The larger horns often found were for longer periods in the field and for resupplying the smaller horns. He said that the hunters didn't intend to use two separate horns and that having to deal with a separate horn getting in the way didn't make any sense. He said that the small horns could be carried in a pocket or a pouch easily enough. Interestingly, this bit of information was also recently mentioned to me by another person from another forum. The old man also told me (and my grandparents) that the practice of using the same grade of powder for priming and loading was the rule as it'd "been the way since the beginning" as was the practice while using Paper cartridges with Muskets. Sounded good to me then and still sounds like good advice. He died at the age of 103 when I was 13, so that would've meant he was born in or around 1864. I remember him telling my grandparents this and other things at their house over dinner when my grandpa, who was born in 1896, showed him a small horn that gramps had hanging from a nail by a wire for years from the basement stair case wall.