for what it's worth, here's the unedited response from my querry of the fellow who made a study of this.
Since i don't get to shoot much, i haven't fired the two Brown Besses (Browns Bess?) he left with me for safekeeping about three years ago, so I cannot attest as to the relative accuracy of one method over another- for that, i would do some experimentation and see which method provides the best results for the individual musket.
Re: Brown Bess loading sequence
Hey there! I'll give you the quick'n'drawn out version!
1) Open pan - the musket is brought down to near the hip, and the pan is uncovered by flipping open the frizzen.
2) Handle cartridge - bring out the cartridge from it's pouch, with the bullet-end in the palm of your hand. Bite off the paper on the powder end. Note, to get the cartridge prepared properly, you're going to have to bite powder.
3) Prime - a small amount of powder is poured into the pan from the cartridge.
4) Shut pan - pretty simple: close the pan, to keep the powder from spilling out.
5) Cast about - the musket brought around so the stock is towards (or sometimes resting on) the ground, and the barrel is up in the air.
6) Charge cartridge - pour the rest of the powder from the cartridge down the barrel, and push the bullet (still in the paper, which serves as wadding) a short way inside the barrel.
7) Draw rammer - pull the ramrod out of it's guides under the barrel, and "start" it, by placing the head about 1/2" inside the barrel.
8) Ram cartridge - shove the ramrod down the barrel until the ball is firmly seated on top of the powder charge, then remove the ramrod from the barrel and slip it back into it's guides, leaving the last 3 or 4 inches free.
9) Return rammer - shove the rammer the last few inches into place, then bring the weapon up to the shoulder arms position.
10) Make ready - bring the weapon up in front of the body, and draw the cock back to the full.
11) Present/Take aim - pretty self explanatory.
12) Fire - Bang.
When done by someone familiar enough with the weapon, you should be able to do the above in 15-20 seconds.
sounds simple, until you remember that there might be some crazy guy running at you with sharp pointy things which he intends to use in order to make your inside become your outsides.
at any rate, this would be the pretty reliably accurate HC/PC version.
best of luck with your project: make good smoke!