I am not going to go into the weeds on a forum like this one. I have a profound understanding of the manufacture of friction primers. I have my copy of the manual lying next to me. When I am communicating with people who know absolutely nothing about the subject, keeping it simple & easily understood is always the first order of business.
Actually, during the Civil War, they discovered that using a wet sponge was very dangerous. The water caused the residue in the barrel to chill & form a crust. Live embers would be trapped inside. When the round was rammed, premature misfires would happen. The solution was to order the use of dry sponging. NPS drill is to use a damp sponge because it forms a better seal & thus a better vacuum when the sponge is removed. Parks Canada does the same. The year to year casualty list from reenacting cannon crews is enough to give anyone pause. That is not an aspersion, that is a fact. Preparing safety lectures based on accidents is one of my duties, so I am well versed on both historic & current dismemberments. The last major casualty in a National Park demo was in the 1960's before anybody knew what they were doing.
As to the NPS drill. I participated in the development of the current manual. Ranger Jim Lewis, who wrote the manual is here at Stones River N.B. I can assure you that the current NPS drill is as close to the late Civil War practice as can be & comport with modern safety concerns. Part of the research involved study of stacks of C.W. photos. I assure you that there are no photos of gun crews bent over with hands on their ears in any of them.
I made my comments about reenacter drill, which include a disclaimer, because people who are not conversant with the Civil War don't know what the drill is supposed to look like. I mean no reflection on reenacting in general, but I have seen too many gun drills with absurd crouching kneeling postures & melodramatic number ones flinging the sponge rammer into the bore to not include a note about it. Getting the history right is my only priority.
If you google National Park living history & historic weapons program policies, you will find the NPS manual for 20 different classes of weapons. That includes WWII weapons as well. "Beach Apparatus Drill Manual (including use of Lyle Gun)" is something that I have absolutely no idea what it is. It is right above Matchlock, I will have to look at that. The photo header includes a shot of the back of my head. My wife is number two on the gun to my left. I believe you will find the drill manuals both interesting & useful.
Absolutely the best C.W. artillery manual is 'ARTILLERIST'S MANUAL, Compiled from various sources & adapted to the service of the United States" By Brig-Gen. John Gibbon, U.S. Vols., Captain Fourth Artillery, U.S. Army. Second Edition, Revised & Enlarged.' (aint that a mouth full?) It is the was produced in 1863 to include Rifled Ordnance that was not in the prewar manual. It starts with the discovery of gun powder, how to manufacture it & continues right up the the state of the art in rifled cannon practice. It is available online. It is the how to book of all how to books.