You don't have time to use a powder measure but you are going to put a ball in the palm of your hand and then cover it with powder then hold the ball and dump the powder in the barrel. First problem I see is how are you going to hold the musket? How much powder is actually going to make it into the barrel?
So I've done this.... We wanted to see if one gets a decent amount of powder or not... and can it be done..., quite easily.....
The musket butt is on the ground, held upright by the right hand,
The shooter grabs a ball from his left waistcoat pocket with the left hand, and secures it in his left palm with his left thumb,
The upper portion of the musket held by the right hand is then moved to the left elbow,
The right hand then grabs the powder horn, moves the tip to the shooters mouth, and the teeth are used to pull the stopper,
The right hand uses the horn, and pours the powder into the palm of the left hand covering the ball ; the musket all the while is still cradled in the left elbow...
The right hand when done pouring moves the horn back to the shooter's mouth where the stopper is replaced, and the horn is released, but it's still on a cord around the body of the shooter so it does not fall...
The right hand then grasps the musket where it did before, allowing the left hand with powder and ball to be free to move to the muzzle, and the powder is poured in while the fingers keep the ball from falling...
The ball is then dropped in, and then the shooter removes the ramrod and rams the ball home to be sure it has reached the powder in the breech...
The musket is then brought up and primed...,
Ready to Fire
It sounds complicated, when written, but it's pretty quick.
We were quite surprise when we did this and checked the amount of powder, and it was enough to give the shooter a good load. Might not go much past 100 yards..., but that's whey they volley fired....
LD