Two, the stupid pinky finger at the end. Try pushing down a ramrod with just a pinky. It won't work. 1:42
Fair enough, you got me there. But (of course there's a but) let me rephrase that: It's unnecessarily making your life more difficult for no good reason. Try that with a ramrod that's been in the weather or has been slightly bend, as so often happens when you use the ramrod as a tool to cook (Which is something mainstream re-enactors won't do exactly because it will bend the ramrod). It will be much more resistent and you can apply absolutely no force with just your pinky.
This is what it says in Casey's drill, which is identical to Hardee in this section, by the way:
(Third motion.) Force the rammer home by placing the little finger of the right hand on the head of the rammer; pass the left hand down the barrel to the extent of the arm, without depressing the shoulder.
Now, this often gets interpreted, as in this video, that one must place the little finger and the little finger only
on the ramrod. But you can place the little finger on the rammer and still use the (whole force of the) hand. My guess is they specifically mention the little finger, as placing another finger would place part of the hand over the loaded barrel. There is no mention of this movement in Napoleonic drill manuals, and again my presumption is that they added is as they realized rammers don't just slide down the gun freely.
As an little addition, this re-enactor does not follow the actual instruction on how to use the rammer.
Insert the rammer as far as the right, and steady it in this position with the thumb of the left hand; seize the rammer at the small end with the thumb and fore-finger of the right hand, the back of the band to the front; press the ball home, the elbows near the body.
He does it the re-enactor way, which you can also see in WoR. Wiggling the ramrod down four times, without much force. Of course, this works because he's using a small charge, no bullet and no paper. In real life, when loading with paper and a realistic charge, even without a bullet, you can't just wiggle the ramrod a little and expect result. You grab the end of the ramrod and ram it down, with force, in one go, and immediatly return the rammer. As it says in the drill manual: You press the ball home. In the 1791 Napoleonic drill, it says (translated from Dutch)
One stretches the arm as long as one can, with the right hand climbing up, to grab the rammer with the extended thumb and bend first finger, while the others remain closed. One stamps twice with force into the barrel [...]
Note that specify the amounts of times you ram down, exactly to avoid wasting time. There's some discussion whether or not to place the thumb on top of the ramrod, or alongside. For safety reasons, we tend to place it alongside but it's harder to apply force that way.
Speaking of re-enactor drill, god, 2:08 made me cringe. That rear-rank barrel is so close to that front-rank man. STEP FORWARD WHEN FIRING DAMN IT.
183. The rear-rank men, in aiming, will each carry the right foot about eight inches to the right, and towards the left heel of the man next it the right, inclining the upper part of the body forward.