Do NOT put any kind of valve on that horn! The valves are not SAFE, as they gum up with BP residue over time, and a spark in the barrel can turn your powder horn into a bomb right before your eyes!! :shake: :youcrazy: :shocked2:
The ONLY SAFE WAY of using a powder horn is to pour the powder into a separate powder MEASURE- either something home-made( my first was from a piece of antler I drilled out until it held the amount of powder I wanted), or a commercial, adjustable Powder measure. ( I own an old Haddaday measure with the funnel attached to the barrel of the measure so I don't miss putting the powder from the measure into the barrel on cold mornings! )
Simply make your horn the traditional way, with a wooden stopper in the mouth, attached to the horn by a leather thong, so you don't lose it, too. Pour the powder into the measure, then put the stopper back into the horn, and put the horn away. Then, and ONLY THEN, pour the powder down the barrel of your gun.
I tried to cut corners years ago using a commercial powder Flask, that was all set up with its own valve system. I was using it to load a revolver cylinder, and the circumstances of loading made it impossible for any embers to still be burning at the bottom of any chamber in the cylinder.
However, the valve became so gummed up I finally had to take the flask apart to clean everything. To my HORROR, I found that BP residue was thickly caked on BOTH SIDES of the cut-off plate, and that the crud was actually bending the plate, and causing the valve NOT TO CLOSE properly. There was a direct line between the barrel of any rifle or shotgun and the powder in the flask if I used that valve in loading powder charges down them! :shocked2: :cursing:
:nono:
Black Powder is safe, if YOU are safe, using it.
If you screw up, you have a bomb in the making. That is why BP clubs and the people who work as range officers are such sticklers about safety on the range. You won't just blow yourself up- you will be hurting other innocent bystanders. My experience is that Range Officers at Black Powder matches are much more strict than those working modern gun ranges. They not only watch how you handle and load the gun on the firing line, but they watch how you handle the gun and accoutrements at the loading benches. They have to do so. :hmm: :thumbsup: