RE: First shot on a clean barrel
IMO it depends on what type of rifle, and what type of projectile you are using. It also depends on what degree of accuracy you need. In my Knight Long Range Hunter I am only concerned about the first shot from a clean barrel. I am concerned with pinpoint accuracy out to 200 yards. I have never seen any one with pinpoint accuracy out to 200 yards with a dirty barrel. But as Cayugad said, if your concern is fifty yard minute of deer accuracy with a roundball or large conical, then pinpoint accuracy is not your major concern.
IMO you should determine your needs first. Then go from there.
I also believe thatthe first shot isyour most dependable shot, as far as gun function is concerned. I have seen a lot of second shot misfires in myshooting days.
Very few people get second shot opportunities with a ML. I always thoroughly clean my barrel after every shot with my Knight. But I shoot the devil out of my Lyman flintlock, with just a quick patch or two after every three or four shots. Tom.