I've seen it once.
It was during a speed shoot, 'bout 85,,, feller was using onna them pre-measured load tubes threaded to his horn with the valve thing?!! Well, long story short, the 1/2 pound of powder went off. The brass chards took off his index finger, they just couldn't save it, the rest of his hand only took percusion injury.. I still know the guy ,,he's a pressman at a local plant,, he does his job, good provider,..
If that is true, then what is the best way to put a fairly precise measured charge in the barrel?
Back in the day,,when a feller bought a rifle,,he got with it', a powder measure. The measure was the best load the maker proved for the rifle.(by "volume")
handi? well, a feller can use a hole drilled in horn just so deep,,or a plugged hollow bone cut just right, or a handfull "just that big !", or a brass measure ,,or,,??
?? or he can just pour right out of the horn,,,,,,,hhmmm,,,