Some must have used what we now call short starters. Baker Rifle corps, were issued loading "pegs" of iron or steel. Also every "other" rifleman was issued
a loading mallet, which had a small diameter shaft as a handle. Read about this somewhere.
Those, btw, are quite nice, Rado. I've not seen any with maple shafts. Just be careful when seating a ball with them, that they don't break and spear you.
We mostly use hickory for the shafts and Wade is correct, we drill a hole to place on the rod's end for the last little push or smack with the palm of the hand
to make sure the ball is on the powder. I did a test with my .40 cal. barrel, chronographing the loads if "just' seated on the powder and with a sharp smack
with my palm on the starter's knob to get a "little" compression of the powder. The difference was 100fps and consistency with the smack, as opposed to a
wide range of velocities if "just pushing" the ball onto the powder - firmly. BP Ctg. competition shooters, when loading ammo give a slightly compression of the
powder - for consistency in ignition and powder burning. We should emulate this. They do not do this because it doesn't work.
The short stud, if to put the ball into the muzzle squarely. If simply pounded in, it is possible to have more weight on one side of the ball that the other. Accurcy
is all about consistency.